CD Manufacturing Dates

From Insulator Wiki (Wikilator)

(Difference between revisions)

Current revision

This is an approximate and incomplete list of dates that CDs were manufactured. If you can fill in some of the missing information, or correct mistakes, please do so!

The Trade Name, Application, and Hobby Nickname are mostly from N.R. Woodward's "The Glass Insulator in America" Reports.
The Start Date and End Date have four notations
- ">" which indicates the date is as specified or after
- "<" which indicates the date is as specified or before
- "~" which indicates the date is approximately
- dates in italics are our best guess, as opposed to fact based.
The References state where this information came from
Comments provides some additional information to help in the dating.
The Assigned Date and Comments show the date of publication of the first reference showing the CD (again, note that this is approximate).

NOTE: Rows in gray deal with CDs that have been deleted, combined with other CDs, or for which there are no known examples.

CD	Trade Name	Application	Hobby Nickname	Start Date	End Date	References	Comments	Assigned Date	Assigned Comments
100		Electric Fence		1945~	1955~	^[1] ^[2]	Unique to SURGE (1940-1978)	1967	[NRW67]
100.2		Electric Fence		1945~	1955~	^[1]	Unique to SURGE (1940-1978)	1976	[Mil76]
100.5	"J" Carrier	Midspan Transposition		1924>	1941<		Unique to PYREX (1924-1941)	1973	[GIaCR]
100.6				1870>	1967<		Unique to HEMINGRAY (1865-1970)	1979	[MilSPG79]
101	Pony	Telephone		1903>	1921<		Unique to BROOKFIELD (1869-1921). Embossing BROOKFIELD only.	1973	[GIaCR]
102	Pony	Telephone	Pony	1878	1912>	^[3]	Made by CALIFORNIA (1912-1916)	1967	[NRW67]
102.3		Telephone		1890	1897		NO NAME or K.C.G.W. (1890-1897). NO NAME of KCGW origin per McDougalds.	1973	[GIaCR]
102.4		Telephone		1883>	1888<	^[4]	Unique to NEW ENG.TEL.& TEL.CO.	1976	[Mil76]
102.7								1979	[MilSPG79]. No other reference. Re-assigned to CD 140.5
103	Pony	Telephone					NO NAME B or GAYNER (1920-1923)	1967	[NRW67]
103.4		Telephone					Unique to NO EMBOSSING	1976	[Mil76]
104	National Pony	Telephone		1912<	1912>			1967	[NRW67]
105		Telephone		1883	1886		NO EMBOSSING or AM.INSULATOR CO. (1883-1886). NO EMBOSSING an American product per McDougalds.	1973	[GIaCR]
106	Pony	Telephone	Pony	1892~	1955	^[5]^[6]		1967	[NRW67]
106.1	Pony	Telephone		1885	1895		Unique to DUQUESNE	1988	[NRW88]
106.2		Telephone					Unique to P.S.S.A.	1976	[Mil76]
106.3		Telephone		1885	1895		DUQUESNE or NO EMBOSSING. NO EMBOSSING a Duquesne product.	1976	[Mil76]
106.4		Telephone					Unique to NO EMBOSSING - MEXICO	1969	Originally CD 406. [NRW69]
106.5		Telephone		1940	1959		Unique to CRISOL TEXCOCO	1988	[NRW88]
107	Pony	Telephone		1924>	1969<		Start date based on ¸ marking end date based on Armstrong marking. All others fall within range.	1967	[NRW67]
107.2		Telephone					Unique to NO EMBOSSING	1976	[Mil76]. Not listed in 1979 Price Guide
108	Pony	Telephone						1969	[NRW69]
109	Fiske & Mott Pony	Telephone	Teardrop Pony or Chicago Teardrop Pony	1893	1894		Unique to CHICAGO INSULATING CO. (1893-1894)	1973	[GIaCR] (listed as CD 105 probably a typo)
109.5	Harloe's Patent	Telephone	Claw	1902	1906		Unique to HARLOE » (1902-1906)	1969	Originally CD 409. [NRW69]
109.7			Johnson & Watson	1908			Unique to JOHNSON & WATSON Pat'd 1908	1976	[Mil76]. Not listed in Woodward's 1988 Report
109.9			Ram's Head				Unique to PAT APP FOR	1976?	[Mil76]. Listed in 1979 and 1995 Price Guides
110	Pony External Thread	Telephone	Spiral Groove or Screw Top	1907	1921<		Unique to BROOKFIELD (1869-1921) Pat'd 1907	1967	[NRW67]
110.5		Telephone	Corkscrew or Screw Top	1884	1886		Unique to NATIONAL INSULATOR CO. (1884-1886)	1973	[GIaCR]
110.6		Telephone	Corkscrew or Screw Top	1884	1886		Unique to NATIONAL INSULATOR CO. (1884-1886)	1976	[Mil76]
111	Carrier	Telephone		1926	1941<	^[7]	Unique to PYREX (1924-1941).	1976	[Mil76]
112	Pony Double Groove	Telephone	Keg or Exchange	1886>	1912>			1967	[NRW67]
112.4		Telephone	Exchange	1890>	1933<		Based on ????	1973	[GIaCR]
112.5		Telephone	Exchange			^[8]	NO EMBOSSING or NO NAME Canadians	1976	[Mil76]. Not listed in Woodward's 1988 Report
113	Pony Double Groove	Telephone	Keg or Exchange	1886>				1967	[NRW67]
113.2		Telephone	Exchange	1885	1895		DUQUESNE or NO NAME	1976	[Mil76]
113.4			Exchange					1979	[MilSPG79]. No other reference. Probably foreign -- CTRG in Milholland's 1976
114	Pony Double Groover	Telephone	Keg or Exchange	1886>	1920~		Unique to HEMINGRAY (1865-1970).	1967	[NRW67]
114.2		Telephone	Exchange	1893	1894		Unique to STANDARD GLASS INSULATOR CO. (1893-1894)	1976	[Mil76]
115	Exchange	Telephone	Exchange	1886>	1912>			1967	[NRW67]
115.1		Telephone		1886>			Unique to NO EMBOSSING.	1988	[NRW88]
116	Large Double Groove	Telephone	Three Rumple	1886>	1912>			1967	[NRW67]
116.5	Double Groove			1903>	1921<		Unique to B	1973	[GIaCR]
117	Twisted Pair	Telephone		1886>	1912>		Unique to NO NAME.	1967	[NRW67]
118		Telephone		1928>	1969<		Unique to NO EMBOSSING. Hemingray dump item start date based on use of carnival.	1973	[GIaCR]
119	O'Brien Patent	Telephone	O'Brien	1885	1903<		Unique to BROOKFIELD (1869-1921) (Pat'd 1885). End based on use of "W" in embossing.	1967	[NRW67]
120	Pony	Telephone						1969	[NRW69]
120.2	Pony	Telephone					PAT APP FOR or PONY	1973	[GIaCR]. Combined with CD 120 in 2003 McDougald's Price Guide.
121	Toll	Telephone	Toll	1880s	1935>	^[9]	Made by STANDARD GLASS INSULATOR CO (1893-1894) and MAYDWELL (1935-1940)	1967	[NRW67]
121.4	American Union	Telegraph		1871>	1893<		Unique to A.U. all have Pat'd 1871. End date based on absence of May 2 1893 patent date.	1973	[GIaCR]
122	Toll	Telephone	Toll	1919~	1969>	^[10]	Made by MCLAUGHLIN (1925-1935) and KERR (1969-1975)	1967	[NRW67]
122.4	CW Carrier	Telephone	1941<	1924>			PYREX (1924-1941) or HEMINGRAY (1865-1970)	1973	[GIaCR]
123		Telegraph		1870	1880		Unique to E.C.& M.CO. (1870-1880)	1969	[NRW69]
123.2		Telegraph		1870	1879<		Unique to CHESTER (1855-1879) (Pat'd 1870 date)	1988	[NRW88]
124	National Pony	Telephone						1967	[NRW67]
124.1				1871~	1873~	^[11]	Unique to PATENT - DEC. 19 1871
124.2		Telephone		1873~		^[11]	Unique to PATENT - DEC. 19 1871	1973	[GIaCR]
124.3		Telephone		1878~		^[11]	Unique to PATENT - DEC. 19 1871	1973	[GIaCR]
124.5		Lightning Rod	Wing Chambers	1877>			Unique to CHAMBERS Pat'd 1877	1973	[GIaCR]
125	Western Union	Telegraph						1967	[NRW67]
126	Western Union	Telegraph	Blob Top	1912<	1912>			1967	[NRW67]
126.1		Telegraph		1870>	1882<		Unique to BROOKFIELD (1869-1921) (Pat'd 1870 date). End date based on all embossings with 55 FULTON ST.	1979	[MilSPG79]
126.3	American Union	Telegraph					BROOKFIELD (1869-1921) A.U. or NO NAME	1969	Originally CD 427? [NRW69]
126.4	Western Union	Telegraph					AM.INSULATOR CO. (1883-1886) or W.E.MFG.CO.	1969	Originally CD 426. [NRW69]
127	Western Union	Telegraph						1969	[NRW69]
127.4		Telegraph					PATENT - DEC. 19 1871 or NO EMBOSSING	1976	[Mil76]
127.6								1979	[MilSPG79] listed as a Boston. Also in Millhollands. Dropped in favor of CD 143.6.
128	CS Carrier	Telephone		1941<	1969>		Made by PYREX (1924-1941) and KERR (1969-1975)	1967	[NRW67]
128.4	Carrier	Telephone	Big Mouth	1933	1967<		Unique to HEMINGRAY (1865-1970). Start date based on use of mold number	1969	Originally CD 428. [NRW69]
129	TS Carrier	Telephone		1954	1975<	^[12]^[13]	1967	[NRW67]
130		Telegraph		1877>	1908<		Unique to CAL.ELEC.WORKS (1877-1908)	1969	[NRW69]
130.1		Telegraph		1877>	1908<		Unique to CAL.ELEC.WORKS (1877-1908)	1973	[GIaCR]. Not listed in Woodward's 1988 Report
130.2			Seilers	1877			Unique to SEILERS Pat'd 1877 probably made by Hemingray	1979	[MilSPG79]
131		Telegraph		1865>	1890<		Dates based on Brookfield embossings. NO NAME insulators ignored.	1967	[NRW67]
131.4		Telegraph		1875<			Start date based on manufacture by Tillotson	1969	Originally CD 431. [NRW69]
131.8		Telegraph		1869	1879	^[14]	Unique to NO EMBOSSING	1976	[Mil76]. Not listed in 1979 Price Guide
132		Telegraph	Bullet					1969	[NRW69]
132.2		Telegraph		1869	1879	^[14]	PAISLEY or NO NAME	1976	[Mil76]
132.4		Lightning Rod	Chambers Companion	1877			Unique to PATENT - DEC. 19 1871 Pat'd 1877	1973	[GIaCR]
133	Regular	Telegraph Telephone	Bullet	1906<	1912>		Made by O.V.G. CO. (1903-1906)	1967	[NRW67]
133.1				1897		^[15]		1990	[McD]
133.2		Telegraph						1973	[GIaCR]
133.3		Telegraph						1976	[Mil76]
133.4		Telegraph	Bullet					1969	[Mil76]
133.5							Unique to TEL.FED.MEX	1990	[McD]
134	Deep Groove			1912<	1912>			1967	[NRW67]
134.4		Secondary					Unique to NO EMBOSSING	1976	[Mil76]
134.6	Philadelphia		Mad Hatter	1896	1921<		Unique to BROOKFIELD (1869-1921) Pat'd 1896	1972	Originally "temporary CD 430" [Mil72]
135	Fiske & Mott Regular		Chicago Diamond Groove	1893	1894		Unique to CHICAGO INSULATING CO. (1893-1894)	1969	[NRW69]
135.5		Telegraph		1861>			Unique to ERW	1973	[GIaCR]
136	B&O	Telegraph		1869>	1921<		BROOKFIELD (1869-1921) or B & O	1969	[NRW69]
136.4		Telegraph	Canadian Boston	1879<	1872>	^[16]	NO EMBOSSING or NO NAME	1976	[Mil76]
136.5				1871	1877		Unique to BOSTON BOTTLE WORKS (1871-1877)	1990	[McD]
136.7		Telegraph					PATENT - OTHER (1880-1881) or NO EMBOSSING	1976	[Mil76]
137		Secondary		1870>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
137.4								1979	[MilSPG79]. Not in McDougald's. Deleted as a fake.
137.5							Unique to NO EMBOSSING	1976	[Mil76]
138	Postal Telegraph			1869>	1921<		Unique to BROOKFIELD (1869-1921)	1967	[NRW67]
138.2		Telegraph						1976	[Mil76]
138.9			Twin Pin					1976	[Mil76]
139	Combination Safety		Combination Safety	1903	1912>		Unique to COMBINATION SAFETY Pat'd 1903	1967	[NRW67]
139.6		Secondary		1924>	1941<		Unique to PYREX (1924-1941)	1976	[Mil76]. Not listed in Woodward's 1988 Report
139.8							Unique to NO EMBOSSING	1976	[Mil76]. Not listed in Woodward's 1988 Report
139.9	USLD			1925	1930		Unique to M„LAUGHLIN (1925-1935)	1969	Originally CD 439. [NRW69]
140	Jumbo	Feeder Cable	Jumbo					1967	[NRW67]
140.5			Cobalt Blob				Unique to NO NAME	1976	Previously CD 102.7 [Mil76]. Not listed in 1979 Price Guide
141		Telephone	Hot Cross Bun or Crosstop				Unique to NO EMBOSSING	1969	[NRW69]
141.5							Unique to NO EMBOSSING	1995	[McDPG95]
141.6			Blackburn	1893			Unique to PATENT - OTHER Pat'd 1893	1990	[McD]
141.7			Twiggs	1905			Unique to TWIGGS Pat'd 1905	1988	[NRW88]
141.8			Buzby	1890			Unique to BUZBY Pat'd 1890	1976	Originally CD 109.9. [Mil76]. Not listed in 1979 Report
141.9			Emmingers	1872			Unique to EMMINGER Pat'd 1872	1976	[Mil76]
142	W.U. Iridized	Telegraph		1939			HEMINGRAY (1865-1970) or NO NAME Pat'd 1939	1967	[NRW67]
142.4		Telegraph		1939			NO NAME or NO EMBOSSING Pat'd 1939	1976	[Mil76]
143	Dwight Pattern	Telegraph		1875	1906>	^[17]^[18]		1969	[NRW69]
143.4		Telegraph		1883	1886	^[19].	AM.INSULATOR CO. (1883-1886) or BROOKFIELD (1869-1921).	1976	[Mil76]
143.5				1883	1892		Unique to T-H.E.CO. (1883-1892)	1973	[GIaCR]
143.6		Telegraph		1871	1877		Unique to BOSTON BOTTLE WORKS (1871-1877)	1976	[Mil76]. Not listed in Woodward's 1988 Report
144	Foree Bain Patent		Foree Bain	1890			Pat'd 1890 Patent assigned to Hemingray 1901	1969	[NRW69]
144.5			Beehive	1890>			Unique to PATENT - OTHER (1890 Date)	1973	[GIaCR]
145		Telegraph		1883~	1947>	^[20]		1967	[NRW67]
145.5
145.6		Telegraph					BOSTON BOTTLE WORKS (1871-1877) or NO EMBOSSING	1973	[GIaCR]
146		Telegraph					Unnamed unit		No Known Examples
146.4							Unique to NO EMBOSSING	1988	[NRW88]
146.5							NO NAME or NO EMBOSSING	1976	[Mil76]. Not listed in 1979 Price Guide
147	Barclay Patent	Telegraph	Spiral Groove or Screw Top	1907	1912>		Pat'd 1907	1967	[NRW67]
148									[McDPG03]
149	Burbrook		Burbrook				BROOKFIELD (1869-1921) or NO EMBOSSING	1969	[NRW69]
150	Deep Groove DP External Thread		Spiral Groove or Barclay or Screw Top	1907	1912>		BROOKFIELD (1869-1921) or BARCLAY Pat'd 1907	1967	[NRW67]
151	ell Double Petticoat	Telegraph						1967	[NRW67]
152	New Western Union	Telegraph & Telephone	Hoopskirt	1910	1921>	^[21]		1967	[NRW67]
152.2
153		Telegraph & Telephone						1967	[NRW67]
154	Double Petticoat	Telegraph & Telephone		1921	1967<	^[21]		1967	[NRW67]
154.3
154.5		Telegraph					DERFLINGHER or NO NAME - MEXICO	1969	Originally CD 454. [NRW69]
154.7
155		Telegraph & Telephone		1938	1978	^[22]^[23]		1967	[NRW67]
155.6				1870>	1967<		Unique to HEMINGRAY (1865-1970)	1976	[Mil76]. Not listed in Woodward's 1988 Report
156		Telegraph						1969	[NRW69]
156.1		Telegraph						1976	[Mil76]
156.2		Telegraph					PATENT - OTHER or NO EMBOSSING	1976	[Mil76]. Not listed in 1979 Price Guide OR Woodward's 1988 Report
157		Telegraph	Teepee				BROOKFIELD (1869-1921) or HEMINGRAY (1865-1970)	1969	[NRW69]
157.5		Telegraph		1893	1894		Unique to STANDARD (1893-1894)	1976	[Mil76]
158		Telegraph						1976	[Mil76]
158.1		Telegraph		1871			CHESTER (1871-1877) or NO EMBOSSING Pat'd 1871	1988	[NRW88]
158.2		Telegraph					BOSTON BOTTLE WORKS (1871-1877) or NO EMBOSSING	1973	[GIaCR]
158.9		Telegraph	Screw Top Boston	1871	1877		Unique to BOSTON BOTTLE WORKS (1871-1877)	1973	[GIaCR]
159		Telegraph	Gregory	1903			Unique to GREGORY Pat'd 1903	1976	[Mil76]
160	Double Petticoat Pony	Telephone	Baby Signal	1889	1957~			1967	[NRW67]
160.4
160.6		Telephone	Pilgram Hat	1885>	1915<		Unique to AM.TEL.& TEL.CO. (1885-1915)	1973	[GIaCR]. Listed in Milholland's Bicentennial and 1979 Price Guide as CD 160.5.
160.7			Ice Cream Cone or Snow Cone	1883	1886		Unique to AM.INSULATOR CO. (1883-1886)	1971	Originally CD 461. Insulators With Embossing Errors
161		Secondary		1916<	1912>		STAR ¥ or CALIFORNIA (1912-1916)	1969	[NRW69]
161.2		Secondary		1869>	1921<		Unique to BROOKFIELD (1869-1921)	1976	[Mil76]
162	Deep Groove Double Petticoat	Secondary	Signal	1890~	1942	^[24]	Started in the late 1880s	1967	[NRW67]
162.05								1979	[MilSPG79]. Not in McDougald's
162.1		Secondary					STAR ¥ or BROOKFIELD (1869-1921)	1976	[Mil76]
162.2								1979	[MilSPG79]. Not in McDougald's
162.3		Secondary					STAR ¥ or BROOKFIELD (1869-1921)	1976	[Mil76]
162.4		Secondary					NO NAME or NO EMBOSSING Canadians	1973	[GIaCR]
162.5	P.R.R.	Telegraph					P.L.W. or P.R.R.	1969	Originally CD 462. [NRW69]
162.6								1979	[MilSPG79]. Not in McDougald's
162.7		Telegraph					Various Mexican only	1976	[Mil76]
163		Secondary						1967	[NRW67]
163.2		Secondary					Unique to NO NAME	1988	[NRW88]
163.4							Unique to WHITALL TATUM ¸ (1922-1946)	1999	[McDPG99]
164	Extra Deep Groove DP	Secondary		1912<	1912>			1967	[NRW67]
164.4		Secondary		1920	1930		Unique to NO EMBOSSING (FRY 1920-1930)	1973	[GIaCR]
165		Secondary		1870>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
165.1		Secondary		1922>	1946<		Unique to WHITALL TATUM ¸ (1922-1946)	1973	[GIaCR]
166		Secondary		1912	1916		Unique to CALIFORNIA (1912-1916)	1969	[NRW69]
166.2		Secondary					E.L.CO. (1890-1910) or NO EMBOSSING	1973	[GIaCR]
167		Secondary		1946		^[25]	ARMSTRONG Á (1946-1969) or NO NAME	1967	[NRW67]
168		Secondary					WHITALL TATUM ¸ (1922-1946) or HEMINGRAY (1865-1970)	1967	[NRW67]
168.5							Unique to NO NAME	1976	[Mil76]
168.6
169		Secondary					WHITALL TATUM ¸ (1922-1946) or HEMINGRAY (1865-1970)	1969	[NRW69]
169.5		Telegraph		1869>	1921<		Unique to BROOKFIELD (1869-1921)	1976	[Mil76]
170		Secondary					Unique to NO EMBOSSING	1969	[NRW69]
170.1		Secondary					Unique to NO EMBOSSING	1973	[GIaCR]
170.4								1979	[MilSPG79]. Not in McDougald's
171	Telegraph or Heavy Telegraph	Telegraph							No Known Examples
172	Small Deep Groove Double Petticoat	Secondary							No Known Examples
173		Secondary		1912<	1921<		Unique to BROOKFIELD (1869-1921)	1967	[NRW67]
174	Wide Groove DP	Secondary		1912<	1921<		Unique to BROOKFIELD (1869-1921)	1967	[NRW67]
174.5				1924>	1941<		Unique to PYREX (1924-1941)
175		Secondary	Door Knob	1870>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
175.5
176	Carrier	Telephone	Mushroom	1929			Unique to WHITALL TATUM ¸ (1922-1946) Pat'd 1929	1976	[Mil76]
176.9			Toadstool				Unique to HEMINGRAY	2000
177							Previously foreign (VEGLA)		No Known Examples
178	Santa Ana	7 500v	Santa Ana	1912<	1912>			1967	[NRW67]
178.5				1915>			Unique to LOCKE (1892-). Only embossing includes 1915 Patent date.	1995	[McDPG95]
179							Previously foreign (ESA ILNS SEDIVER)		No Known Examples
180	Liquid Insulator		Liquid Insulator	1894<			Unique to LIQUID INSULATOR old style as of 1894 Pat	1976	[Mil76]
180.1			Fluid Insulator	1894<			Unique to FLUID INSULATOR old style as of 1894 Pat	1990	[McD]. Now CD 180.5
180.5			Fluid Insulator	1894<				1999	[McDPG99]
181			Pluto				Unique to NO EMBOSSING	1973	[GIaCR]
181.5			Spaceman				Unique to NO EMBOSSING	1995	[McDPG95]
182	Dry Spot	Telegraph	Dry Spot	1926	1926	^[26]	Unique to DRY SPOT INSULATOR Whitall Tatum (1922-1946) Pat'd 1929	1976	[Mil76]
183		Primary		1870>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
184			Climax	1869>	1921<		Unique to CLIMAX Brookfield (1869-1921) dump item	1990	[McD]
185	Mine Insulator		Mine Insulator	1912<	1912>			1967	[NRW67]
185.2							Unique to B.E.L.CO.	1976	[Mil76]
186		Spark Gap Insulator		1940	1940	^[27]	Unique to HEMINGRAY (1865-1970)	1976	[Mil76]
186.1		Spark Gap Insulator		1940	1940	^[27]	Unique to HEMINGRAY (1865-1970)	1976	[Mil76]
186.2		Spark Gap Insulator	Nut	1940	1940	^[27]	Unique to HEMINGRAY (1865-1970)	1976	[Mil76]
187	Brown Pony	Telephone	Duplex	1912<	1912>			1967	[NRW67]
188	Brown Deep Groove		Duplex	1912<	1912>			1967	[NRW67]
189									No Known Examples
190/191	Hibbard Transposition	Telephone	Two Piece Tramp	1886>	1912>			1967	[NRW67]
192.1/193.1			Two Piece Tramp	1886>			AM.TEL.& TEL.CO. (1885-1915) or NO EMBOSSING	1988	[McD] 192.1 / [Mil76] 193.1
192/193	Hibbard Transposition	Telephone	Two Piece Tramp	1886>			AM.TEL.& TEL.CO. (1885-1915) or NO EMBOSSING	1976	[Mil76]
194.5/195.5			Two Piece Tramp	1930	1941<		Unique to PYREX (1924-1941) Pat'd 1930	1990	[McD]
194/195	Transposition	Telephone	Two Piece Tramp	1886>	1967<		Unique to HEMINGRAY (1865-1970)	1969	[NRW69]
196	Perfect Transposition	Telephone	Tramp	1886>	1912>			1967	[NRW67]
196.2			Tramp	1883>	1910<	^[28]	Unique to H.G.CO.	1990	[McD]
196.5			Tramp	1883>	1910<	^[29]	Unique to H.G.CO.	1990	[McD]
197	Transposition	Telephone	Tramp	1886>			WHITALL TATUM ¸ (1922-1946) or HEMINGRAY (1865-1970)	1967	[NRW67]
198				1886>					No Known Examples
199	Transposition	Telephone	Tramp	1902	1903		Unique to PRISM ¬ (1902-1903)	1973	[GIaCR]
200	Transposition	Telephone	Tramp	1900~	1915~	^[30]	STAR ¥ CALIFORNIA (1912-1916) or NO NAME	1967	[NRW67]
201	Transposition	Telephone	Tramp	1886>	1912>		HEMINGRAY (1865-1970) CALIFORNIA (1912-1916) or H.G.CO.	1967	[NRW67]
202	Transposition	Telephone	Tramp	1896	1912>	^[31]		1967	[NRW67]
203	Transposition	Telephone	Tramp	1946		^[32]		1967	[NRW67]
203.2	Transposition	Telephone	Tramp	1956	1969<		Unique to ARMSTRONG Á (1946-1969) Pat'd 1956	1976	[Mil76]
204	Transposition	Telephone	Locke Crosstop or Tramp	1892	1895	^[31]	LOCKE (1892-) or NO EMBOSSING Pat'd 1894. NO EMBOSSINGs made first around 1892 only manufactured for a short while.	1973	[GIaCR]
205	Transposition	Telephone or Secondary	Tramp	1886>	1912>			1967	[NRW67]
205.5	Large Double Groove DP			1886>			Unique to NO EMBOSSING	1988	[NRW88]
206		Telephone	Castle	1935>	1940<	^[33]	Unique to NO EMBOSSING	1969	[NRW69]
206.5		Telephone	Claw	1902	1906		Unique to HARLOE » (1902-1906)	1979	[MilSPG79]
207				1900	1921<		Unique to B Pat'd 1900	1973	[GIaCR]
207.5
208	Top Groove Telephone	Telephone	Top Groove Hot Cross Bun	1890>	1912>		Made by CALIFORNIA (1912-1916)	1967	[NRW67]
209				1890>					GIFONA - Chilean piece.
210	Standard Postal Telegraph	Telegraph		1917			POSTAL or NO EMBOSSING Pat'd 1917	1967	[NRW67]
211	No Leak	Telegraph	No Leak	1908	1921<	^[34]	Unique to BROOKFIELD (1869-1921) Pat'd 1908	1973	[GIaCR]
212				1890>					No Known Examples
213	Top Groove Western Union	Telegraph		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
214		Telegraph		1921>		^[21]		1967	[NRW67]
215				1890>					No Known Examples
216		Primary		1890>				1967	[NRW67]
217		Primary		1946>	1969<		Unique to ARMSTRONG Á (1946-1969)	1967	[NRW67]
218		Primary		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1976	[Mil76]
219		Primary		1890>			HEMINGRAY (1865-1970) or NO EMBOSSING	1967	[NRW67]
220		Primary		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
220.1							1979	[MilSPG79]. Not in McDougald's
221		Primary		1890>			WHITALL TATUM ¸ (1922-1946) or HEMINGRAY (1865-1970)	1967	[NRW67]
222	Small Top Groove Double Petticoat	5 000v		1890>					No Known Examples
223	High Voltage Double Petticoat	7 500v		1890>					No Known Examples
224	High Voltage Double Petticoat	10 000v		1890>					No Known Examples
225		5 000v		1890>	1921<		Unique to BROOKFIELD (1869-1921)	1967	[NRW67]
226		5 000v		1890>	1912>		Unique to NO NAME	1967	[NRW67]
226.3		Primary		1903>	1921<		Unique to B	1988	[NRW88]
227	Large Groove Double Petticoat	5 000v		1890>	1912>				No Known Examples
228		10 000v		1890>	1921<		Unique to BROOKFIELD (1869-1921)	1967	[NRW67]
228.5		Primary		1946>	1969<		Unique to ARMSTRONG Á (1946-1969)	1988	[NRW88]
229	Top Groove Double Petticoat	3 000v		1890>	1912>				No Known Examples
229.6		Primary		1920	1930		Unique to NO EMBOSSING (FRY 1920-1930)	1988	[NRW88]
230		6 600v	Frog Eyes	1890>				1967	[NRW67]
230.1		6 600v		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1976	[Mil76]
230.2		6 600v		1946>	1969<		Unique to ARMSTRONG Á (1946-1969)	1976	[Mil76]
231		Primary		1951		^[35]	KIMBLE (1952-1970) or HEMINGRAY (1865-1970)	1976	[Mil76]
231.2		Primary		1952>	1970<		Unique to KIMBLE (1952-1970)	1973	[GIaCR]
232		11 000v		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
232.1		11 000v		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1973	[GIaCR]
232.2				1890>
233		6 600v		1926	1912>		^[7]	1967	[NRW67]
233.2				1890>	1967<		Unique to HEMINGRAY (1865-1970)	1990	[McD]
234		8 000v		1924>	1941<		Unique to PYREX (1924-1941)	1967	[NRW67]
234.5				1890>
235		8 000v		1926	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
236		Primary		1890>	1921<		Unique to BROOKFIELD (1869-1921)	1976	[Mil76]
237		13 500v		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
238		Primary		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
238.1				1890>	1967<		Unique to HEMINGRAY (1865-1970)	1995	[McDPG95]
238.2				1946>	1969<		Unique to ARMSTRONG Á (1946-1969)	1990	[McD]
238.6				1890>
239		Primary		1951		^[36]	KIMBLE (1952-1970) or HEMINGRAY (1865-1970)	1967	[NRW67]
239.2		Primary		1952>	1970<		Unique to KIMBLE (1952-1970)	1976	[Mil76]. Not listed in Woodward's 1988 Report
240		13 500v		1927	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
240.2		Primary		1890>			NO NAME or NO EMBOSSING	1976	[Mil76]
240.5		Primary		1926	1941<	^[7]	Unique to PYREX (1924-1941).	1976	[Mil76]
241		6 600v		1916~	1967<	^[31]	Unique to HEMINGRAY (1865-1970).	1967	[NRW67]
241.2		6 600v		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1976	[Mil76]
242		10 000v		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
243		15 000v		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
244			Pomona or Crosstop	1892~	1895~		Unique to NO EMBOSSING Line construction use from ~1892 to 1895	1976	[Mil76]
244.5				1890>			Unique to GREELEY	1990	[McD]
245		Primary		1890>	1892		Unique to T-H. (1883-1892)	1973	[GIaCR]
245.2				1890>
246	High Voltage Double Petticoat	10 000v		1890>					No Known Examples
247		Primary		1890>			Unique to NO EMBOSSING	1976	[Mil76]
247.3				1890>
248/311/311	Montana	15 000v	Montana or Stacker	1890>			HEMINGRAY (1865-1970) or PYREX (1924-1941)	1967	[NRW67]
249	Provo		Provo	1902	1967<	^[37]	Unique to HEMINGRAY (1865-1970)	1976	[Mil76]
250		Cable		1899	1899		Unique to N.E.G.M.CO. (1899)	1969	[NRW69]
250.2		Telephone		1890>			Unique to ERICSSON	1976	[Mil76]
251		Cable		1890>	1912>			1967	[NRW67]
252	Knowles Cable	Cable		1890>	1912>			1967	[NRW67]
253	Knowles Cable	Cable		1900	1903		Unique to KNOWLES (1900-1903)	1976	[Mil76]
254	Knowles Cable	Cable		1890>	1912>			1967	[NRW67]
255		Cable		1890>					No Known Examples
256	Manhattan Cable	Cable	Manhattan	1890>			Unique to MANHATTAN	1969	[NRW69]
257		Cable	Mickey Mouse	1890>			HEMINGRAY (1865-1970) or PATENT - OTHER	1967	[NRW67]
258		Cable	Roman Helmet	1890>			Unique to CABLE	1976	[Mil76]
259		Cable	Roman Helmet	1890>	1912>			1967	[NRW67]
260		Cable	Roman Helmet	1890>	1912>		Made by CALIFORNIA (1912-1916)	1969	[NRW69]
261				1890>					No Known Examples
262	Columbia Single Petticoat	Cable	Baby Columbia	1890>	1912>		Unique to COLUMBIA	1967	[NRW67]
263	Columbia	Cable	Columbia	1890>	1912>			1967	[NRW67]
264	Columbia	Cable	Columbia	1890>			Unique to COLUMBIA	1976	[Mil76]
265	Fisher	Third Rail	Fisher	1883>	1888~		FISHER or NO EMBOSSING Electric railway developed mid 1880s in use 'till 1888	1973	[GIaCR]
265.1
266	Boston Cable	Cable	Boston Cable	1890>			Unique to PATENT - OTHER (1890 Date)	1967	[NRW67]
267	Boston Cable	Cable		1890>	1912>			1967	[NRW67]
267.5		Cable	Straight Sides	1899	1899		Unique to N.E.G.M.CO. (1899)	1976	[Mil76]
268	Crown	Cable	Crown	1895	1912>		Unique to THE CROWN Pat'd 1895	1967	[NRW67]
268.5		Cable		1893	1894		Unique to STANDARD (1893-1894)	1976	[Mil76]
269	New Jumbo	Cable	Eared Jumbo	1890>	1912>		OAKMAN MFG.CO. (1890-1897) or JUMBO	1967	[NRW67]
270		Cable		1890>			Unique to NO EMBOSSING	1976	[Mil76]
271				1890>
272		6 600v		1890>	1912>			1967	[NRW67]
273		5 000v		1890>	1912>		Unique to NO EMBOSSING	1967	[NRW67]
274	High Voltage Double Petticoat	11 000v		1890>					No Known Examples
275		10 000v		1890>	1912>		LOCKE (1892-) or NO NAME	1967	[NRW67]
276				1890>					No Known Examples
277	Extra Large Top Groove Double Petticoat	6 600v		1890>					No Known Examples
278				1890>					No Known Examples
279				1890>					No Known Examples
280		Primary						1967	[NRW67]
281		10 000v					HEMINGRAY (1865-1970) or LYNCHBURG ¨ (1923-1925)	1967	[NRW67]
282	Provo	13 200v	Provo	1897		^[38]		1967	[NRW67]
283	Provo	15 000v	Provo	1897		^[39]		1967	[NRW67]
284	Floy	11 000v		1912<	1912>		Unique to FLOY	1967	[NRW67]
285	4-inch Edison		Edison	1892			Unique to NO EMBOSSING Pat'd 1892	1967	[NRW67]
286				1892>			Unique to LOCKE (1892-)	1976	[Mil76]
286.9				1886>	1898<		Unique to WESTINGHOUSE (1886-1898)	1990	[McD]
287		10 000v		1895	1912>	^[31]	LOCKE (1892-) or NO NAME. NO NAME manufactured by Brookfield.	1967	[NRW67]
287.1				1894	1895	^[31]	Unique to LOCKE (1892-). Manufactured by Brookfield.	1976	[Mil76]
287.2				1891	1894	^[31]	Unique to BROOKFIELD (1869-1921).	1973	[GIaCR]
288	Mershon	12 000v	Mershon	1912<	1912>			1967	[NRW67]
289		18 000v		1912<	1912>		LOCKE (1892-) or NO EMBOSSING	1967	[NRW67]
289.9				1889	1893	^[31]	Unique to PATENT - OTHER Pat'd 1889.	1990	[McD]
290				1890>					No Known Examples
291				1890>			HEMINGRAY (1865-1970) or NO NAME	1976	[Mil76]
292	Lachine Triple Petticoat	Primary		1890>				1967	[NRW67]
292.5				1900	1903		Unique to KNOWLES (1900-1903)	1976	[Mil76]
293		Primary		1897			Unique to LOCKE (1892-)	1976	[Mil76]
293.1		Primary		1892>			Unique to LOCKE (1892-)	1988	[NRW88]
294				1899	1899		Unique to N.E.G.M.CO. (1899)	1976	[Mil76]
295		10 000v		1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
296		10 000v		1890>	1912>			1967	[NRW67]
297		15 000v		1890>	1912>			1967	[NRW67]
298			Ballerina	1890>			Unique to NO EMBOSSING	1976	[Mil76]
299		11 000v		1890>	1921<		Unique to BROOKFIELD (1869-1921)	1967	[NRW67]
299.1		10 000v		1902	1903		Unique to PRISM ¬ (1902-1903)	1976	[Mil76]
299.2		Primary		1920	1930		Unique to NO EMBOSSING (FRY 1920-1930)	1976	Originally CD 315.5? [Mil76]. Not listed in 1979 Price Guide
299.7				1890>
300		20 000v		1890>	1912>		LOCKE (1892-) or BROOKFIELD (1869-1921)	1967	[NRW67]
301				1890>			Unique to NO EMBOSSING	1976	[Mil76]
301.2		Primary		1920	1930		Unique to NO EMBOSSING (FRY 1920-1930)	1988	[NRW88]
301.5				1890>	1967<		Unique to HEMINGRAY (1865-1970)	1976	[Mil76]. Not listed in Woodward's 1988 Report
302	7-inch Muncie	15 000v	Muncie	1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
303.5			Provo	1890>	1967<		Unique to HEMINGRAY (1865-1970)	1990	[McD]
303/310	9-inch Muncie	20 000	Muncie	1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
304/310			Coolie Hat	1890>			HEMINGRAY (1865-1970) or NO EMBOSSING	1976	[Mil76]. Not listed in 1979 Price Guide
305	Small Top Groove Triple Petticoat	7 500v		1890>					No Known Examples
306				1923	1925		Unique to LYNCHBURG ¨ (1923-1925)	1973	[GIaCR]
307		10 000v	Viking Helmet	1890>	1967<		Unique to HEMINGRAY (1865-1970)	1967	[NRW67]
308	Cable	6 600v	Viking Helmet	1890>	1912>		NO EMBOSSING or NO NAME	1967	[NRW67]
309			Beal's	1899			Unique to BEAL'S Pat'd 1899	1990	[McD]
309.5				1886>	1898<		Unique to WESTINGHOUSE (1886-1898)	1990	[McD]
310
311
312							Unique to NO EMBOSSING	1990	[McD]. Previously sleeve to CD 249 has been dropped in 2003 PG.
313							Unique to NO EMBOSSING	1990	[McD]
313.1							Unique to NO EMBOSSING	1990	[McD]
314							Unique to NO EMBOSSING	1990	[McD]. Previously sleeve to CD 317.7 has been dropped in 2003 PG.
315	Type HG			1902	1903		Unique to PRISM ¬ (1902-1903)	1967	[NRW67]
315.5								1979	[MilSPG79]. Not in McDougald's
316		7 500v		1890>	1921<		Unique to BROOKFIELD (1869-1921)	1967	[NRW67]
316.5								1979	[MilSPG79]. Not in McDougald's
317		Lightning Rod	Candlestick or Bell Chambers	1877>			Unique to CHAMBERS Pat'd 1877	1973	[GIaCR]
317.5		Lightning Rod		1877>			Unique to CHAMBERS Pat'd 1877	1973	[GIaCR]
317.7				1883>	1910<	^[40]	Unique to H.G.CO.	1990	[McD]
317.8/313/313/313.1				1902			Unique to PATENT - OTHER Pat'd 1902	1990	[McD]
317.9							Unique to NO EMBOSSING	1976	[Mil76]
318	Niagara High Potential	20 000v		1892>	1912>		Unique to LOCKE (1892-)	1967	[NRW67]
319	Special High Potential	21 000v		1892>	1912>		Unique to LOCKE (1892-)	1967	[NRW67]
320		17 000v		1924>	1941<		Unique to PYREX (1924-1941)	1967	[NRW67]
321			Bat Ears	1902	1903		PRISM ¬ (1902-1903) or PATENT - OTHER	1969	[NRW69]
322		23 000v		1927	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
323		30 000v		1926	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
324		35 000v		1932	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
325		40 000v		1926	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
326		45 000v		1932	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
327		50 000v		1926	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
328		55 000v		1932	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
328.2				1924>	1941<		Unique to PYREX (1924-1941)	1995	[McDPG95]
329									No Known Examples
330		66 000v		1932	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
331		70 000v		1930	1941<	^[7]	Unique to PYREX (1924-1941).	1967	[NRW67]
332									No Known Examples
333				1902	1903		Unique to PRISM ¬ (1902-1903)	1973	[GIaCR]
338		16 000v		1890>	1921<		Unique to BROOKFIELD (1869-1921)	1967	[NRW67]
342		25 000v		1903	1903	^[41]	Unique to LOCKE (1892-)	1967	[NRW67]

[edit]

References

[GIaCR] Cranfill, Gary & Kareofelas, Greg (1973). The Glass Insulator A Comprehensive Reference.
[MilSPG79] Keating, Paul (1979). Milholland's Suggested Insulator Price Guide.
[McD] McDougald, John & Carol (1990). Insulators A History and Guide to North American Glass Pintype Insulators.
[McDPG95] McDougald, John & Carol (1995). Price Guide to North American Pintype Insulators.
[McDPG99] McDougald, John & Carol (1999). Price Guide to North American Pintype Insulators.
[McDPG03] McDougald, John & Carol (2003). Price Guide to North American Pintype Insulators.
[Mil72] Milholland, Marion (1972). Most About Glass Insulators Revised.
[Mil76] Milholland, Marion (1976). Most About Glass Insulators Bicentennial Edition.
[NRW67] Woodward, N.R. (1967). The Glass Insulator in America 1967 Report.
[NRW69] Woodward, N.R. (1969). The Glass Insulator in America 1969 Report.
[NRW88] Woodward, N.R. (1988). The Glass Insulator in America 1988 Report.

[edit]

General Dating Rules

1886> typically indicates a start date based on the origin of transposition theory
1890> typically indicates a start date based on the saddle groove patent
1912> or 1912< typically indicates the CD appeared in the Brookfield 1912 Catalog

[edit]

Notes

↑ ^1.0 ^1.1 CD 100 and CD 100.2 Crown Jewels, December 1985. http://cjow.com/archive/article.php?month=12&a=12Surge%20Fencer%20Post%20and%20Insulator.htm&year=1985
↑ Per N.R. Woodward, as shared by Bill Meier on ICON, 12/20/2020: The first CD #100 insulators were embossed with the words "T.M.REQ.PAT.PEND", below the SURGE name, which is in large letters. This is not an error embossing as explained below. Later insulators replace this with the words "REG.U.S.PAT.OFF." During a visit to the facility on April 22, 1970, I was permitted to review a file which contained several documents relating to the fence insulators. One was a letter from their attorney advising that the marking T.M.REQ. (Trade Mark Requested) was not conventional, and should be changed to the normal REG.U.S.PAT.OFF., which obviously was done. Another was a letter from a patent attorney stating that in his opinion the insulator would not be patentable since it did not differ materially from the usual telephone insulators. It would seem that he was also correct, as Design Patent number 113,240 was rejected. Unfortunately I had no means of obtaining copies; and those files in all probability no longer exist.
↑ CD 102 Per N.R. Woodward on Hemingray
↑ CD 102.4 a product of the Lyndeborough Glass Company, South Lyndeboro, New Hampshire (1866-1888). Many shards have been found by a digger at the old glassworks site. Per David Whitten, 10/12/2009 email.
↑ "The CD 106 Hemingray-9 was introduced in either 1892 or 1893 and continued in production until at least the early 1950's (my example is 1951) until replaced by the CD 107 Hemingray-9 in 1956." Per Bob Stahr, 09/12/2007 email on ICON.
↑ CD 106 Per N.R. Woodward on Hemingray
↑ ^7.00 ^7.01 ^7.02 ^7.03 ^7.04 ^7.05 ^7.06 ^7.07 ^7.08 ^7.09 ^7.10 ^7.11 ^7.12 ^7.13 McDougald, John & Carol (1990). Insulators A History and Guide to North American Pintype Insulators
↑ CD 112.5 McDougald's 2003 combined w/CD 112.4
↑ "CD #121 was the original AT&T long distance style used starting with the first long lines in the 1880s. Until WWI it was esssentially unchanged." N.R. Woodward on ICON, 12/14/2009.
↑ "CD #122 came along in 1919-20, the change in design was the larger square wire groove; and corresponding greater outward slant to the skirt and slightly greater base width" N.R. Woodward on ICON, 12/14/2009.
↑ ^11.0 ^11.1 ^11.2 " Hemingray offered their smallest "bullet", the CD 124.1 probably as early as the 1871 Patent they wear. It is believed the 124.2 superseded the .1 as early as 1873, with the 124.3 being offered by about the time the very first Brookfield produced "pony" was introduced in the July, 1878 Tillotson catalogue." Brent Burger in ICON 2009.10.15 digest.
↑ CD #129 should have a date of 1954. First ones were made that year by both Owens and Armstrong. The single-page brochure I have advertising the "TS" as a "new insulator" has a print date of 1955. Per N.R. Woodward on ICON, 10/16/2009
↑ End date based on Kerr production.
↑ ^14.0 ^14.1 See Jan, 2007 CJ (http://www.cjow.com/archive/article.php?month=1&a=01paisley_insulators.htm&year=2007). Unique to Paisley insulators.
↑ CD 133.1 Included in 1897 Electrical Appliance Catalog
↑ The versions with segmented threads are through to have been made by Boston Bottle Works, or Bay State Glass Works, active from 1872-1879. See http://cjow.com/archive/article.php?month=8&a=08Patent%20Pages.htm&year=1979 , http://cjow.com/archive/article.php?month=9&a=09Samuel%20Oakman%20and%20Boston%20Insulator%20Production.htm&year=1988 , and http://cjow.com/archive/article.php?month=6&a=06Boston%20Family%20Album.htm&year=2004
↑ Unsure when Canadian glass houses started using threads, but likely in the 1870s. All Dwight Patterns are thought to be Brookfield products, but were never made in Old Bridge colors. This implies these stopped being made by 1906. Other CD 143s could have been made later.
↑ per Barret Nicpon, 8/15/2016 on ICON: As far as the Dwight CD-143 use era, I would suggest that a general turn-of-century window is probably appropriate for these pieces. This isn't based on any written or historical data, but rather on my own digging experience. They seem to have begun to be used sometime in perhaps the mid-to-late 1890s, and their use was probably truncated by the beginnings of G.N.W. TEL. CO. CD-145 production. These seem to have been in prolific use by the early 1900s. I can't personally offer much assurance on the accuracy of these dates, unfortunately. As far as the use of threadless in Canada goes, I believe the magic date for the switchover to threaded glass took place around 1875-1877, depending on the company and individual line. Again, this is based on my own personal experience of line construction dates compared with digging finds. This is also based on correspondence with other collectors who have indicated threadless glass can be found on even newer lines on rare occasions. This, I assume, is an example of a frugal line superintendent or telegraph company continuing to re-use new-old-stock insulators into more modern eras. Overwhelmingly, it seems threadless were no longer being used by the beginning of 1877 and had been replaced by early 143s, such as threaded 743.x, Montreal Telegraph CD-143s, and other unembossed 143s.
↑ CD 143.4 McDougald's states that manufactured at similar time to CD 145
↑ CD 145 Probably first made by AMERICAN. Hemi clear units made at least until 1947.
↑ ^21.0 ^21.1 ^21.2 1946 Hemingray Catalog
↑ CD 155 Per N.R. Woodward on Hemingray
↑ CD 155 KERR known with 1978 date code
↑ CD 162 Per N.R. Woodward on Hemingray
↑ CD 167 Per N.R. Woodward on Whitall Tatum
↑ The Rainbow Riders' Trading Post, June 15, 1995. Vol. 4, No. 6, p9. "The Millville Report" by Richard Wentzel. "...figures A, B, and C verify production of 1,241 pieces during trial automated production from April 12 through April 17, plus 882 pieces produced on June 7, for a total of 2,133, plus an unspecified amount produced on April 6."
↑ ^27.0 ^27.1 ^27.2 CD 186, 186.1, and 186.2 are experimental Hemingray pieces made in 1940. The date code all three CDs insulators is "38:". CD 186 is shown in Utility Patent 2,392,342 issued to Alwin G. Steinmayer on January 8, 1946 See http://www.insulators.info/pictures/?id=120222643
↑ CD 196.2 1893-1910 per Bob Stahr note
↑ CD 196.5 1893-1910 per Bob Stahr note
↑ CD 200 Insulator of the Week 27 Dec 2007. http://www.insulators.info/wiki/IOTW_CD_200
↑ ^31.0 ^31.1 ^31.2 ^31.3 ^31.4 ^31.5 ^31.6 Gish, Elton (1994). Fred M. Locke A Biography
↑ CD 203 Per N.R. Woodward on Whitall Tatum
↑ CD 206 thought to have been made by both McLaughlin and Maydwell
↑ CD 211 1909 - 12 or so per trade articles from Elton/Bob Stahr
↑ CD 231 1951 start per N.R. Woodward
↑ CD 239 1951 start per N.R. Woodward
↑ CD 249 Bob Stahr (7/7/9 note) agreement dated Aug 2 1902 with shipment due 60 days after
↑ CD 282 Included in 1897 Electrical Appliance Catalog
↑ CD 283 Included in 1897 Electrical Appliance Catalog
↑ CD 317.7 1893-1910 per Bob Stahr note
↑ CD 342s were made in a single production run in late 1903. The very first CD 342 tops had no embossing and were likely prototypes made before the embossing was engraved. Note that unembossed bases were produced May - December, 1900 for the M-2795 gutter tops. CD 342s with unembossed bases are reconstructed from a CD 342 top and a M-2795 bottom. Per correspondence with Mike Spadafora, 10/29/2010.

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Category: CD Numbers

CD Manufacturing Dates

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 * The Trade Name, Application, and Hobby Nickname are mostly from N.R. Woodward's "The Glass Insulator in America" Reports.
-* The Start Date and End Date have three notations
+* The Start Date and End Date have four notations
 ** ">" which indicates the date is as specified or after
 ** "<" which indicates the date is as specified or before
 ** "~" which indicates the date is approximately
+** dates in italics are our best guess, as opposed to fact based.
 * The References state where this information came from
 * Comments provides some additional information to help in the dating.
-* The Assigned Date and Comments show when the CD was originally assigned (again, note that this is approximate).
+* The Assigned Date and Comments show the date of publication of the first reference showing the CD (again, note that this is approximate).
 NOTE:  Rows in gray deal with CDs that have been deleted, combined with other CDs, or for which there are no known examples.
-{| style="text-align:center; border-collapse: collapse;" border="1" cellpadding="2"
+{|style="text-align:center; border-collapse: collapse;" border="1" cellpadding="2"
+!CD
+!Trade Name
+!Application
+!Hobby Nickname
+!Start Date
+!End Date
+!References
+!Comments
+!Assigned Date
+!Assigned Comments
 |-
-! CD
+| align="left" |100|| &nbsp;|| Electric Fence|| &nbsp;|| 1945~|| 1955~|| <ref name="surge">CD 100 and CD 100.2 Crown Jewels, December 1985.  http://cjow.com/archive/article.php?month=12&a=12Surge%20Fencer%20Post%20and%20Insulator.htm&year=1985</ref> <ref name="surge2">Per N.R. Woodward, as shared by Bill Meier on ICON, 12/20/2020: The first CD #100 insulators were embossed with the words "T.M.REQ.PAT.PEND", below the SURGE name, which is in large letters. This is not an error embossing as explained below.  Later insulators replace this with the words "REG.U.S.PAT.OFF."
-! Trade Name
-! Application
+During a visit to the facility on April 22, 1970, I was permitted to review a file  which contained several documents relating to the fence insulators.  One was a letter from their attorney advising that the marking T.M.REQ. (Trade Mark Requested) was not conventional, and  should be changed to the normal REG.U.S.PAT.OFF., which obviously was done.  Another was a letter from a patent attorney  stating that in his opinion the insulator would not be patentable since it did not differ materially from the usual telephone insulators.  It would seem that he was also correct, as Design Patent number 113,240 was rejected. Unfortunately I had no means of obtaining copies; and those files in all probability no longer exist.</ref>|| Unique to SURGE (1940-1978)|| 1967|| [NRW67]
-! Hobby Nickname
-! Start Date
-! End Date
-! References
-! Comments
-! Assigned Date
-! Assigned Comments
-|-
-|-
-| align="left" |100|| &nbsp;|| Electric Fence|| &nbsp;|| 1945~|| 1955~|| <ref name="surge">CD 100 and CD 100.2 Crown Jewels, December 1985.  http://cjow.com/archive/article.php?month=12&a=12Surge%20Fencer%20Post%20and%20Insulator.htm&year=1985</ref>|| Unique to SURGE (1940-1978)|| 1967|| [NRW67]
 |-
 | align="left" |100.2|| &nbsp;|| Electric Fence|| &nbsp;|| 1945~|| 1955~|| <ref name="surge" />|| Unique to SURGE (1940-1978)|| 1976|| [Mil76]
 |-
 | align="left" |102.4|| &nbsp;|| Telephone|| &nbsp;|| 1883>|| 1888<|| <ref>CD 102.4 a product of the Lyndeborough Glass Company, South Lyndeboro, New Hampshire (1866-1888). Many shards have been found by a digger at the old glassworks site.  Per David Whitten, 10/12/2009 email.</ref>|| Unique to NEW ENG.TEL.& TEL.CO.|| 1976|| [Mil76]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
 |align="left" |102.7|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| 1979|| [MilSPG79].  No other reference.  Re-assigned to CD 140.5
 |-
 |-
 | align="left" |112.4|| &nbsp;|| Telephone|| Exchange|| 1890>|| 1933<|| &nbsp;|| Based on ????|| 1973|| [GIaCR]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
 | align="left" |112.5|| &nbsp;|| Telephone|| Exchange|| &nbsp;|| &nbsp;|| <ref>CD 112.5 McDougald's 2003  combined w/CD 112.4</ref>|| NO EMBOSSING or NO NAME  Canadians|| 1976|| [Mil76].  Not listed in Woodward's 1988 Report
 |-
 |-
 | align="left" |113.2|| &nbsp;|| Telephone|| Exchange|| 1885|| 1895|| &nbsp;|| DUQUESNE or NO NAME|| 1976|| [Mil76]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
 | align="left" |113.4|| &nbsp;|| &nbsp;|| Exchange|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| 1979|| [MilSPG79].  No other reference.  Probably foreign -- CTRG in Milholland's 1976
 |-
 |-
 | align="left" |120|| Pony|| Telephone|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| 1969|| [NRW69]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
 | align="left" |120.2|| Pony|| Telephone|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| PAT APP FOR or PONY|| 1973|| [GIaCR].  Combined with CD 120 in 2003 McDougald's Price Guide.
 |-
-| align="left" |121|| Toll|| Telephone|| Toll|| 1894<|| 1935>|| Made by STANDARD GLASS INSULATOR CO (1893-1894) and MAYDWELL (1935-1940)|| &nbsp;|| 1967|| [NRW67]
+| align="left" |121|| Toll|| Telephone|| Toll|| 1880s|| 1935>|| <ref name="woodward20091214a">"CD #121 was the original AT&T long distance style used starting with the first long lines in the 1880s.  Until WWI it was esssentially unchanged." N.R. Woodward on ICON, 12/14/2009.</ref>|| Made by STANDARD GLASS INSULATOR CO (1893-1894) and MAYDWELL (1935-1940)|| 1967|| [NRW67]
 |-
 | align="left" |121.4|| American Union|| Telegraph|| &nbsp;|| 1871>|| 1893<|| &nbsp;|| Unique to A.U.  all have Pat'd 1871.  End date based on absence of May 2 1893 patent date.|| 1973|| [GIaCR]
 |-
-| align="left" |122|| Toll|| Telephone|| Toll|| 1935<|| 1969>|| Made by MCLAUGHLIN (1925-1935) and KERR (1969-1975)|| &nbsp;|| 1967|| [NRW67]
+| align="left" |122|| Toll|| Telephone|| Toll|| 1919~|| 1969>|| <ref name="woodward20091214b">"CD #122 came along in 1919-20, the change in design was the larger square wire groove;  and corresponding greater outward slant to the skirt and slightly greater base width"  N.R. Woodward on ICON, 12/14/2009.</ref>|| Made by MCLAUGHLIN (1925-1935) and KERR (1969-1975)|| 1967|| [NRW67]
 |-
 | align="left" |122.4|| CW Carrier|| Telephone|| 1941<|| 1924>|| &nbsp;|| &nbsp;|| PYREX (1924-1941) or HEMINGRAY (1865-1970)|| 1973|| [GIaCR]
 |-
 | align="left" |127.4|| &nbsp;|| Telegraph|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| PATENT - DEC. 19  1871 or NO EMBOSSING|| 1976|| [Mil76]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
 | align="left" |127.6|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| 1979|| [MilSPG79] listed as a Boston.  Also in Millhollands. Dropped in favor of CD 143.6.
 |-
-| align="left" |128|| CS Carrier|| Telephone|| &nbsp;|| 1941<|| 1969>|| Made by PYREX (1924-1941) and KERR (1969-1975)|| &nbsp;|| 1967|| [NRW67]
+| align="left" |128|| CS Carrier|| Telephone|| &nbsp;|| 1941<|| 1969>|| &nbsp;|| Made by PYREX (1924-1941) and KERR (1969-1975)||  1967|| [NRW67]
 |-
 | align="left" |128.4|| Carrier|| Telephone|| Big Mouth|| 1933|| 1967<|| &nbsp;|| Unique to HEMINGRAY (1865-1970).  Start date based on use of mold number|| 1969|| Originally CD 428.  [NRW69]
 |-
-| align="left" |129|| TS Carrier|| Telephone|| &nbsp;|| 1933>|| 1975<|| &nbsp;|| Start date based on use of mold numbers by Hemingray  end date based on Kerr production.  All other embossings fall in this range.|| 1967|| [NRW67]
+| align="left" |129|| TS Carrier|| Telephone|| &nbsp;|| 1954|| 1975<|| <ref>CD #129 should have a date of 1954.  First ones were made that year by both Owens and Armstrong.  The single-page brochure I have advertising the "TS" as a "new insulator" has a print date of 1955.  Per N.R. Woodward on ICON, 10/16/2009</ref><ref>End date based on Kerr production.</ref>|| 1967|| [NRW67]
 |-
 | align="left" |130|| &nbsp;|| Telegraph|| &nbsp;|| 1877>|| 1908<|| &nbsp;|| Unique to CAL.ELEC.WORKS (1877-1908)|| 1969|| [NRW69]
 | align="left" |131.4|| &nbsp;|| Telegraph|| &nbsp;|| 1875<|| &nbsp;|| &nbsp;|| Start date based on manufacture by Tillotson|| 1969|| Originally CD 431.  [NRW69]
 |-
-| align="left" |131.8|| &nbsp;|| Telegraph|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Unique to NO EMBOSSING|| 1976|| [Mil76].  Not listed in 1979 Price Guide
+| align="left" |131.8|| &nbsp;|| Telegraph|| &nbsp;|| 1869|| 1879|| <ref name="paisley">See Jan, 2007 CJ (http://www.cjow.com/archive/article.php?month=1&a=01paisley_insulators.htm&year=2007).  Unique to Paisley insulators.</ref> || Unique to NO EMBOSSING|| 1976|| [Mil76].  Not listed in 1979 Price Guide
 |-
 | align="left" |132|| &nbsp;|| Telegraph|| Bullet|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| 1969|| [NRW69]
 |-
-| align="left" |132.2|| &nbsp;|| Telegraph|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| PAISLEY or NO NAME|| 1976|| [Mil76]
+| align="left" |132.2|| &nbsp;|| Telegraph|| &nbsp;|| 1869|| 1879|| <ref name="paisley" />|| PAISLEY or NO NAME|| 1976|| [Mil76]
 |-
 | align="left" |132.4|| &nbsp;|| Lightning Rod|| Chambers Companion|| 1877|| &nbsp;|| &nbsp;|| Unique to PATENT - DEC. 19  1871  Pat'd 1877|| 1973|| [GIaCR]
 |-
-| align="left" |133|| Regular|| Telegraph  Telephone|| Bullet|| 1906<|| 1912>|| Made by O.V.G. CO. (1903-1906)|| &nbsp;|| 1967|| [NRW67]
+| align="left" |133|| Regular|| Telegraph  Telephone|| Bullet|| 1906<|| 1912>||  &nbsp;|| Made by O.V.G. CO. (1903-1906)||1967|| [NRW67]
 |-
 | align="left" |133.1|| &nbsp;|| &nbsp;|| &nbsp;|| 1897|| &nbsp;|| <ref>CD 133.1 Included in 1897 Electrical Appliance Catalog</ref>|| &nbsp;|| 1990|| [McD]
 | align="left" |134.4|| &nbsp;|| Secondary|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Unique to NO EMBOSSING|| 1976|| [Mil76]
 |-
-| align="left" |134.6|| Philadelphia|| &nbsp;|| Mad Hatter|| 1896|| 1921<|| &nbsp;|| Unique to BROOKFIELD (1869-1921)  Pat'd 1896|| 1976|| [Mil76]
+| align="left" |134.6|| Philadelphia|| &nbsp;|| Mad Hatter|| 1896|| 1921<|| &nbsp;|| Unique to BROOKFIELD (1869-1921)  Pat'd 1896|| 1972|| Originally "temporary CD 430" [Mil72]
 |-
 | align="left" |135|| Fiske & Mott Regular|| &nbsp;|| Chicago Diamond Groove|| 1893|| 1894|| &nbsp;|| Unique to CHICAGO INSULATING CO. (1893-1894)|| 1969|| [NRW69]
 |-
 | align="left" |137|| &nbsp;|| Secondary|| &nbsp;|| 1870>|| 1967<|| &nbsp;|| Unique to HEMINGRAY (1865-1970)|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
 | align="left" |137.4|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| 1979|| [MilSPG79].  Not in McDougald's.  Deleted as a fake.
 |-
 |-
 | align="left" |139|| Combination Safety|| &nbsp;|| Combination Safety|| 1903|| 1912>|| &nbsp;|| Unique to COMBINATION SAFETY  Pat'd 1903|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
 | align="left" |139.6|| &nbsp;|| Secondary|| &nbsp;|| 1924>|| 1941<|| &nbsp;|| Unique to PYREX (1924-1941)|| 1976|| [Mil76].  Not listed in Woodward's 1988 Report
 |-
 | align="left" |142.4|| &nbsp;|| Telegraph|| &nbsp;|| 1939|| &nbsp;|| &nbsp;|| NO NAME or NO EMBOSSING  Pat'd 1939|| 1976|| [Mil76]
 |-
-| align="left" |143|| Dwight Pattern|| Telegraph|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| 1969|| [NRW69]
+| align="left" |143|| Dwight Pattern|| Telegraph|| &nbsp;||<I>1875</I>||<I>1906></I>||<ref>Unsure when Canadian glass houses started using threads, but likely in the 1870s.  All Dwight Patterns are thought to be Brookfield products, but were never made in Old Bridge colors.  This implies these stopped being made by 1906.  Other CD 143s could have been made later.</ref><ref>per Barret Nicpon, 8/15/2016 on ICON: As far as the Dwight CD-143 use era, I would suggest that a general
+turn-of-century window is probably appropriate for these pieces. This isn't
+based on any written or historical data, but rather on my own digging
+experience. They seem to have begun to be used sometime in perhaps the
+mid-to-late 1890s, and their use was probably truncated by the beginnings
+of G.N.W. TEL. CO. CD-145 production. These seem to have been in prolific
+use by the early 1900s. I can't personally offer much assurance on the
+accuracy of these dates, unfortunately.
+As far as the use of threadless in Canada goes, I believe the magic date
+for the switchover to threaded glass took place around 1875-1877, depending
+on the company and individual line. Again, this is based on my own personal
+experience of line construction dates compared with digging finds. This is
+also based on correspondence with other collectors who have indicated
+threadless glass can be found on even newer lines on rare occasions. This,
+I assume, is an example of a frugal line superintendent or telegraph
+company continuing to re-use new-old-stock insulators into more modern
+eras. Overwhelmingly, it seems threadless were no longer being used by the
+beginning of 1877 and had been replaced by early 143s, such as threaded
+.x, Montreal Telegraph CD-143s, and other unembossed 143s.</ref>|| &nbsp;|| 1969|| [NRW69]
 |-
 | align="left" |143.4|| &nbsp;|| Telegraph|| &nbsp;|| 1883|| 1886|| <ref>CD 143.4 McDougald's states that manufactured at similar time to CD 145</ref>.|| AM.INSULATOR CO. (1883-1886) or BROOKFIELD (1869-1921).|| 1976|| [Mil76]
 |-
 | align="left" |145.6|| &nbsp;|| Telegraph|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| BOSTON BOTTLE WORKS (1871-1877) or NO EMBOSSING|| 1973|| [GIaCR]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |146|| &nbsp;|| Telegraph|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Unnamed unit|| &nbsp;|| Never Officially Assigned
+| align="left" |146|| &nbsp;|| Telegraph|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Unnamed unit|| &nbsp;|| No Known Examples
 |-
 | align="left" |146.4|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Unique to NO EMBOSSING|| 1988|| [NRW88]
 |-
 | align="left" |162|| Deep Groove Double Petticoat|| Secondary|| Signal|| 1890~|| 1942|| <ref>CD 162 Per N.R. Woodward on Hemingray</ref>|| Started in the late 1880s|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
 | align="left" |162.05|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| 1979|| [MilSPG79].  Not in McDougald's
 |-
 |-
 | align="left" |170.4|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| 1979|| [MilSPG79].  Not in McDougald's
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |171|| Telegraph or Heavy Telegraph|| Telegraph|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |171|| Telegraph or Heavy Telegraph|| Telegraph|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |172|| Small Deep Groove Double Petticoat|| Secondary|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |172|| Small Deep Groove Double Petticoat|| Secondary|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |173|| &nbsp;|| Secondary|| &nbsp;|| 1912<|| 1921<|| &nbsp;|| Unique to BROOKFIELD (1869-1921)|| 1967|| [NRW67]
 |-
 | align="left" |176.9|| &nbsp;|| &nbsp;|| Toadstool|| &nbsp;|| &nbsp;|| &nbsp;|| Unique to HEMINGRAY|| 2000||
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |177|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Previously foreign (VEGLA)|| &nbsp;|| Never Officially Assigned
+| align="left" |177|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Previously foreign (VEGLA)|| &nbsp;|| No Known Examples
 |-
 | align="left" |178|| Santa Ana|| 7 500v|| Santa Ana|| 1912<|| 1912>|| &nbsp;|| &nbsp;|| 1967|| [NRW67]
 |-
 | align="left" |178.5|| &nbsp;|| &nbsp;|| &nbsp;|| 1915>|| &nbsp;|| &nbsp;|| Unique to LOCKE (1892-).  Only embossing includes 1915 Patent date.|| 1995|| [McDPG95]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |179|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Previously foreign (ESA ILNS  SEDIVER)|| &nbsp;|| Never Officially Assigned
+| align="left" |179|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Previously foreign (ESA ILNS  SEDIVER)|| &nbsp;|| No Known Examples
 |-
 | align="left" |180|| Liquid Insulator|| &nbsp;|| Liquid Insulator|| 1894<|| &nbsp;|| &nbsp;|| Unique to LIQUID INSULATOR  old style as of 1894 Pat|| 1976|| [Mil76]
 | align="left" |181.5|| &nbsp;|| &nbsp;|| Spaceman|| &nbsp;|| &nbsp;|| &nbsp;|| Unique to NO EMBOSSING|| 1995|| [McDPG95]
 |-
-| align="left" |182|| Dry Spot|| Telegraph|| Dry Spot|| 1929|| 1946<|| &nbsp;|| Unique to DRY SPOT INSULATOR  Whitall Tatum (1922-1946)  Pat'd 1929|| 1976|| [Mil76]
+| align="left" |182|| Dry Spot|| Telegraph|| Dry Spot|| 1926|| 1926|| <ref>The Rainbow Riders' Trading Post, June 15, 1995.  Vol. 4, No. 6, p9.  "The Millville Report" by Richard Wentzel. "...figures A, B, and C verify production of 1,241 pieces during trial automated production from April 12 through April 17, plus 882 pieces produced on June 7, for a total of 2,133, plus an unspecified amount produced on April 6."</ref> || Unique to DRY SPOT INSULATOR  Whitall Tatum (1922-1946)  Pat'd 1929|| 1976|| [Mil76]
 |-
 | align="left" |183|| &nbsp;|| Primary|| &nbsp;|| 1870>|| 1967<|| &nbsp;|| Unique to HEMINGRAY (1865-1970)|| 1967|| [NRW67]
 |-
 | align="left" |188|| Brown Deep Groove|| &nbsp;|| Duplex|| 1912<|| 1912>|| &nbsp;|| &nbsp;|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |189|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |189|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |190/191|| Hibbard Transposition|| Telephone|| Two Piece Tramp|| 1886>|| 1912>|| &nbsp;|| &nbsp;|| 1967|| [NRW67]
 |-
 | align="left" |197|| Transposition|| Telephone|| Tramp|| 1886>|| &nbsp;|| &nbsp;|| WHITALL TATUM ¸ (1922-1946) or HEMINGRAY (1865-1970)|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |198|| &nbsp;|| &nbsp;|| &nbsp;|| 1886>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |198|| &nbsp;|| &nbsp;|| &nbsp;|| 1886>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |199|| Transposition|| Telephone|| Tramp|| 1902|| 1903|| &nbsp;|| Unique to PRISM ¬ (1902-1903)|| 1973|| [GIaCR]
 |-
 | align="left" |211|| No Leak|| Telegraph|| No Leak|| 1908|| 1921<|| <ref>CD 211 1909 - 12 or so per trade articles from Elton/Bob Stahr</ref>|| Unique to BROOKFIELD (1869-1921)  Pat'd 1908|| 1973|| [GIaCR]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |212|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |212|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |213|| Top Groove Western Union|| Telegraph|| &nbsp;|| 1890>|| 1967<|| &nbsp;|| Unique to HEMINGRAY (1865-1970)|| 1967|| [NRW67]
 |-
 | align="left" |214|| &nbsp;|| Telegraph|| &nbsp;|| 1921> || &nbsp;|| <ref name="hemi1946" /> || &nbsp;|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |215|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |215|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |216|| &nbsp;|| Primary|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| 1967|| [NRW67]
 |-
 | align="left" |221|| &nbsp;|| Primary|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| WHITALL TATUM ¸ (1922-1946) or HEMINGRAY (1865-1970)|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |222|| Small Top Groove Double Petticoat|| 5 000v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |222|| Small Top Groove Double Petticoat|| 5 000v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |223|| High Voltage Double Petticoat|| 7 500v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |223|| High Voltage Double Petticoat|| 7 500v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |224|| High Voltage Double Petticoat|| 10 000v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |224|| High Voltage Double Petticoat|| 10 000v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |225|| &nbsp;|| 5 000v|| &nbsp;|| 1890>|| 1921<|| &nbsp;|| Unique to BROOKFIELD (1869-1921)|| 1967|| [NRW67]
 |-
 | align="left" |226.3|| &nbsp;|| Primary|| &nbsp;|| 1903>|| 1921<|| &nbsp;|| Unique to B|| 1988|| [NRW88]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |227|| Large Groove Double Petticoat|| 5 000v|| &nbsp;|| 1890>|| 1912>|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |227|| Large Groove Double Petticoat|| 5 000v|| &nbsp;|| 1890>|| 1912>|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |228|| &nbsp;|| 10 000v|| &nbsp;|| 1890>|| 1921<|| &nbsp;|| Unique to BROOKFIELD (1869-1921)|| 1967|| [NRW67]
 |-
 | align="left" |228.5|| &nbsp;|| Primary|| &nbsp;|| 1946>|| 1969<|| &nbsp;|| Unique to ARMSTRONG Á (1946-1969)|| 1988|| [NRW88]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |229|| Top Groove Double Petticoat|| 3 000v|| &nbsp;|| 1890>|| 1912>|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |229|| Top Groove Double Petticoat|| 3 000v|| &nbsp;|| 1890>|| 1912>|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |229.6|| &nbsp;|| Primary|| &nbsp;|| 1920|| 1930|| &nbsp;|| Unique to NO EMBOSSING (FRY 1920-1930)|| 1988|| [NRW88]
 |-
 | align="left" |245.2|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;||
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |246|| High Voltage Double Petticoat|| 10 000v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |246|| High Voltage Double Petticoat|| 10 000v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |247|| &nbsp;|| Primary|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| Unique to NO EMBOSSING|| 1976|| [Mil76]
 |-
 | align="left" |254|| Knowles Cable|| Cable|| &nbsp;|| 1890>|| 1912>|| &nbsp;|| &nbsp;|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |255|| &nbsp;|| Cable|| &nbsp;|| 1890>|| &nbsp;|| &nbsp; || &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |255|| &nbsp;|| Cable|| &nbsp;|| 1890>|| &nbsp;|| &nbsp; || &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |256|| Manhattan Cable|| Cable|| Manhattan|| 1890>|| &nbsp;|| &nbsp;|| Unique to MANHATTAN|| 1969|| [NRW69]
 |-
 | align="left" |260|| &nbsp;|| Cable|| Roman Helmet|| 1890>|| 1912>|| &nbsp;|| Made by CALIFORNIA (1912-1916)|| 1969|| [NRW69]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |261|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |261|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |262|| Columbia Single Petticoat|| Cable|| Baby Columbia|| 1890>|| 1912>|| &nbsp;|| Unique to COLUMBIA|| 1967|| [NRW67]
 |-
 | align="left" |273|| &nbsp;|| 5 000v|| &nbsp;|| 1890>|| 1912>|| &nbsp;|| Unique to NO EMBOSSING|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |274|| High Voltage Double Petticoat|| 11 000v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |274|| High Voltage Double Petticoat|| 11 000v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |275|| &nbsp;|| 10 000v|| &nbsp;|| 1890>|| 1912>|| &nbsp;|| LOCKE (1892-) or NO NAME|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |276|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |276|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |277|| Extra Large Top Groove Double Petticoat|| 6 600v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |277|| Extra Large Top Groove Double Petticoat|| 6 600v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |278|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |278|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |279|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |279|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |280|| &nbsp;|| Primary|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| 1967|| [NRW67]
 |-
 | align="left" |289.9|| &nbsp;|| &nbsp;|| &nbsp;|| 1889|| 1893|| <ref name="LockeBio" />|| Unique to PATENT - OTHER  Pat'd 1889.|| 1990|| [McD]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |290|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |290|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |291|| &nbsp;|| &nbsp;|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| HEMINGRAY (1865-1970) or NO NAME|| 1976|| [Mil76]
 |-
 | align="left" |304/310|| &nbsp;|| &nbsp;|| Coolie Hat|| 1890>|| &nbsp;|| &nbsp;|| HEMINGRAY (1865-1970) or NO EMBOSSING|| 1976|| [Mil76].  Not listed in 1979 Price Guide
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |305|| Small Top Groove Triple Petticoat|| 7 500v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |305|| Small Top Groove Triple Petticoat|| 7 500v|| &nbsp;|| 1890>|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |306|| &nbsp;|| &nbsp;|| &nbsp;|| 1923|| 1925|| &nbsp;|| Unique to LYNCHBURG ¨ (1923-1925)|| 1973|| [GIaCR]
 |-
 | align="left" |328.2|| &nbsp;|| &nbsp;|| &nbsp;|| 1924>|| 1941<|| &nbsp;|| Unique to PYREX (1924-1941)|| 1995|| [McDPG95]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |329|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |329|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |330|| &nbsp;|| 66 000v|| &nbsp;|| 1932|| 1941<|| <ref name="McDs" />|| Unique to PYREX (1924-1941).|| 1967|| [NRW67]
 |-
 | align="left" |331|| &nbsp;|| 70 000v|| &nbsp;|| 1930|| 1941<|| <ref name="McDs" />|| Unique to PYREX (1924-1941).|| 1967|| [NRW67]
-|- style="background:silver;"
+|- style="background:#E0E0E0;"
-| align="left" |332|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| Never Officially Assigned
+| align="left" |332|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| &nbsp;|| No Known Examples
 |-
 | align="left" |333|| &nbsp;|| &nbsp;|| &nbsp;|| 1902|| 1903|| &nbsp;|| Unique to PRISM ¬ (1902-1903)|| 1973|| [GIaCR]
 | align="left" |338|| &nbsp;|| 16 000v|| &nbsp;|| 1890>|| 1921<|| &nbsp;|| Unique to BROOKFIELD (1869-1921)|| 1967|| [NRW67]
 |-
-| align="left" |342|| &nbsp;|| 25 000v|| &nbsp;|| 1892>|| &nbsp;|| &nbsp;|| Unique to LOCKE (1892-)|| 1967|| [NRW67]
+| align="left" |342|| &nbsp;|| 25 000v|| &nbsp;|| 1903|| 1903|| <ref>CD 342s were made in a single production run in late 1903.  The very first CD 342 tops had no embossing and were likely prototypes made before the embossing was engraved.  Note that unembossed bases were produced May - December, 1900 for the M-2795 gutter tops.  CD 342s with unembossed bases are reconstructed from a CD 342 top and a M-2795 bottom.  Per correspondence with Mike Spadafora, 10/29/2010.</ref>|| Unique to LOCKE (1892-)|| 1967|| [NRW67]
 |}
 * [McDPG99] McDougald, John & Carol (1999).  Price Guide to North American Pintype Insulators.
 * [McDPG03] McDougald, John & Carol (2003).  Price Guide to North American Pintype Insulators.
+* [Mil72] Milholland, Marion (1972).  Most About Glass Insulators Revised.
 * [Mil76] Milholland, Marion (1976).  Most About Glass Insulators Bicentennial Edition.
 * [NRW67] Woodward, N.R. (1967).  The Glass Insulator in America  1967 Report.