Original glass trade vintage catalog for PENNSYLVANIA WIRE GLASS COMPANY, Executive office was located at 1612 Market Street, Philadelphia, PA. Manufacturers of Flat Wire, Actinic Glass. Type H, Heat-intercepting or resisting. US Government Specs DD-G-451. Disbound from a large 1938 industrial glass catalog, this unique old one page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro glass library.