The Denver area glass works (initially the Robert Good Works in the mid to late 1890s...(insulators/products marked: GOOD or R.Good, Jr.).... the Western Flint Glass Company (c1899-1900) ( items marked: W.F.G. Co.) ....and the Western Glass Manufactuing Company (items marked: W.G.M. Co.) (c.1901-08). All of the forementioned were "thinking" producing glass insulators thru the years for the quickly growing telephone and telegraph businesses fluorishing throughout Denver and other western US communities.