Original vintage magazine ad, R. D. NUTTAL COMPANY, of Pittsburgh, PA. Mining Machine Gears. Lyman Tube and Supply Company Canada; Jobbers, Banks-Miller Supply Company, Huntington, W.VA; Superior Supply Company, Bluefield, W.VA.  Pictured are Double Reduction speed Reducer Type DVR and a group of Nuttall heat-treated and hardened mining machine gears.  All Nuttall Products are sold throughout the Westinghouse Electric & Mfg Company.  Old 1928 R D Nuttal mining industry advertisement.