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Uploaded on Jul 2, 2008
Aultman Double Star steam traction engine's Stephenson valve gear, at the National Threshers show, Wauseon OH, June 2008.
Operator loosened the engine up for a short time, then put it in gear and moved out.
2 cylinder simple engine with a 2-speed transmission, engaged by dog clutches. This is the same Aultman of Aultman-Taylor, but a separate company that he had founded earlier. Year is approximately 1906.