Original electrical trade vintage catalog for SPECIALTY DEVICE COMPANY, was located in Cincinnati, OH. Manufacturers of Bierce Mono-Bolt tubular guy guard, standard telescopic earth auger and Bierce original cone anchor are shown and described. Disbound from a large 1949 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 equipment library.