Original heating trade vintage catalog for PRAT-DANIEL CORPORATION, was located at 183 Madison Avenue, New York City, NY. Manufacturers of Thermix Air Heater, Fan, Dust Collector and Stacks. Disbound from a large 1931 industrial catalog, this unique old one page technical brochure would display beautifully matted and framed. A marvelous addition to your retro industrial heating equipment library. Slight damp stain on outer edge.