Original exhaust trade vintage catalog for THE R. C. MAHON COMPANY, main office was located in Detroit, MI. Manufacturers of Blowpipe and Shaving Exhaust System. Pictured is one of the world's largest shavings exhaust systems, consisting of six main ducts. Collectors, Feeder tables, Fan Units. 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 equipment library. Slight damp stain on outer edge.