Original electrical trade vintage catalog for THE SCREW MACHINE PRODUCTS CORPORATION, was located in Providence, RI. Manufacturers of interior telephone systems. Select-O-Phone with automatic switchboard, desk phones and wall phones. Disbound from a large 1916 electrical construction materials book, this unique old one page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro telecom equipment library. Contains a small amount of residual glue on edge.