Original electrical trade vintage catalog for D. W. ONAN & SONS INC. Was located at 2146 Royalston Avenue, Minneapolis, MN. Manufacturers of Electric power plants and generators. Low cost insurance wherever power failures may cause property losses, service interruptions or danger to life. For farms, homes, business, and industries. Disbound from a large 1948 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.