Original industrial trade vintage catalog for TROY ENGINE & MACHINE COMPANY, was located at 21 Railroad Avenue, Troy, PA. Manufacturers of Piston Valve Steam Engines, Generating Sets, Generators and Switchboards. By-Product Power offers method of cutting power and production costs. Unbound from a large 1936 industrial catalog, this unique old one page technical brochure would exhibit beautifully matted and framed. A fantastic addition to your retro industrial equipment collection.