Original heating trade vintage catalog for ANDERSON PRODUCTS INCORPORATED, was located in Cambridge, MA. Manufacturers of Vent-Rite Radiator Air Valves, Air-Flow Bent Valves. Orifinators of Balanced Radiation by Controlled Venting. Disbound from a large 1938 industrial heating catalog, this unique old one page technical brochure would display wonderfully matted and framed. A marvelous addition to your retro heating equipment library.