Original insulation trade vintage catalog for NATIONAL VULCANIZED FIBRE COMPANY, was located in Wilmington, DE. Manufacturers of sheets, fabricated parts, rods, tubes and formed fibre. Used in Phenolite laminated Bakelite and Peerless insulation. 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.