Original electrical trade vintage catalog for McGILL MANUFACTURING COMPANY, was located in Valparaiso, IN. Manufacturers of switches, sockets, lamp guards and changers. No. 41 thin model levolier, 1010 heavy-duty canopy pull, no 23 fixture switch are pictured, plus many more. Disbound from a large 1942 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. Contains a small amount of residual glue on edge.