Original electrical trade vintage catalog for SQUARE D COMPANY, was located at 710 South Third Street, Milwaukee, WI. Manufacturers of AC-DC Motor Automatic Starters. Magnetic contactor, pressure, float & vacuum switches, control stations and Edgerest resistors. Industrial Controller division. Disbound from a large 1931 electrical construction materials book, this unique old one page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro electric equipment library. Slight damp stain on outer edge.