Original insulation trade vintage catalog for WILMINGTON FIBRE SPECIALTY COMPANY, was located in New Castle, DE. Manufacturers of Fyberoid (fish paper), used as lining for metal boxes and tubes, insulating heads of tacks and staples. Made in sheets, rolls and coils. Ohmoid is laminated phenolic insulation made in five different grades. Offered in sheets, rods, tubes and special shapes. Genuine vulcanized fibre. Disbound from a large 1944 electrical construction materials book, this unique old one page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro electric equipment library.