Original electrical trade vintage catalog for KEYSTONE ELECTRIC MANUFACTURING COMPANY, was located at Janney and Tioga Streets, Philadelphia, PA. Manufacturers of Fluorescent fixtures, complete line of commercial, residential and industrial. Slimline VF-496, SL-496, R-496, R-340,VF-440, F-420, TR-340 and 15B Chrome with R-15 reflector are shown. Disbound from a large 1948 electrical construction materials book, this unique old one page technical specifications brochure would display wonderfully matted and framed. A marvelous addition to your retro electric lighting equipment library.