CD Manufacturing Dates

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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  18751906>[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. ↑ 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
  2. ↑ 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.
  3. ↑ CD 102 Per N.R. Woodward on Hemingray
  4. ↑ 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.
  5. ↑ "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.
  6. ↑ CD 106 Per N.R. Woodward on Hemingray
  7. ↑ 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
  8. ↑ CD 112.5 McDougald's 2003 combined w/CD 112.4
  9. ↑ "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.
  10. ↑ "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. ↑ 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.
  12. ↑ 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
  13. ↑ End date based on Kerr production.
  14. ↑ 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.
  15. ↑ CD 133.1 Included in 1897 Electrical Appliance Catalog
  16. ↑ 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
  17. ↑ 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.
  18. ↑ 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.
  19. ↑ CD 143.4 McDougald's states that manufactured at similar time to CD 145
  20. ↑ CD 145 Probably first made by AMERICAN. Hemi clear units made at least until 1947.
  21. ↑ 21.0 21.1 21.2 1946 Hemingray Catalog
  22. ↑ CD 155 Per N.R. Woodward on Hemingray
  23. ↑ CD 155 KERR known with 1978 date code
  24. ↑ CD 162 Per N.R. Woodward on Hemingray
  25. ↑ CD 167 Per N.R. Woodward on Whitall Tatum
  26. ↑ 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. ↑ 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
  28. ↑ CD 196.2 1893-1910 per Bob Stahr note
  29. ↑ CD 196.5 1893-1910 per Bob Stahr note
  30. ↑ CD 200 Insulator of the Week 27 Dec 2007. http://www.insulators.info/wiki/IOTW_CD_200
  31. ↑ 31.0 31.1 31.2 31.3 31.4 31.5 31.6 Gish, Elton (1994). Fred M. Locke A Biography
  32. ↑ CD 203 Per N.R. Woodward on Whitall Tatum
  33. ↑ CD 206 thought to have been made by both McLaughlin and Maydwell
  34. ↑ CD 211 1909 - 12 or so per trade articles from Elton/Bob Stahr
  35. ↑ CD 231 1951 start per N.R. Woodward
  36. ↑ CD 239 1951 start per N.R. Woodward
  37. ↑ CD 249 Bob Stahr (7/7/9 note) agreement dated Aug 2 1902 with shipment due 60 days after
  38. ↑ CD 282 Included in 1897 Electrical Appliance Catalog
  39. ↑ CD 283 Included in 1897 Electrical Appliance Catalog
  40. ↑ CD 317.7 1893-1910 per Bob Stahr note
  41. ↑ 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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