Original electrical insulation trade vintage catalog for ILLINOIS ELECTRIC PORCELAIN COMPANY. Main office and factory was located in Macomb, IL. Manufacturers of suspension insulators, one-piece pin type distribution, shackle and spool, switch rod, bushings, boxes, covers and receptacles. Made of the finest wet-process porcelain manufacture. Assembled with neat Portland Cement, with joints of minimum possible thickness. Disbound from a large 1943 electrical construction materials book, this unique old six page technical specifications brochure would display wonderfully matted and framed. A marvelous addition to your retro electric equipment library. Pages are detached and contains a small amount of residual glue on edge.