Robert Longtine patented a gas engine in 1901 that featured dual intake valves; one for gas and one for air. He assigned his engine to the Bradford Gas Engine Co., and some were bui an early one being displayed at Coolspring. However, in 1902, William W. Flickinger moved his firm from Cochranton, Pennsylvania, to Bradford, Pennsylvania, and purchased the Bradford Gas Engine Co. After some changes in design, a Flickinger catalog shows a wide offering; the largest being 200hp.
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