Original insulation trade vintage catalog for IRVINGTON VARNISH & INSULATOR COMPANY. Main office and factory was located in Irvington, NJ. Manufacturers of electrical insulation. Irv-O-LIte flexible extruded plastic and varnished tubings, Harvel oil stop, insulating varnishes and wire markers are listed. Hyflex, Ivi-flex, Irv-O-volt and more. Disbound from a large 1944 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.