Original electrical trade vintage catalog for BENTLEY, HARRIS MANUFACTURING. COMPANY. Main office and factory was located at 999 Hector Street, Conshohocken, PA. Manufacturers of BH Fiberglas sleeving, the high efficiency insulation with exclusive non fraying and non stiffening features. Disbound from a large 1948 architect construction materials book, this unique old one page technical specifications brochure would display wonderfully matted and framed. A marvelous addition to your retro electrical equipment library.