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M. Mercier’s Four-Stroke V-Twin Powered Roller Skates

M. Mercier's Two-Stroke V-Twin Powered Roller Skates

Updated – M. Constantini of Paris, France was an early prolific inventor of carburetors and other automotive subassemblies. He was also interested in motorized roller skate designs and built two sets of the curious devices. The pair of machines was reviewed in an April 1906, Scientific American article. Featured here are four photos from the February 25, 1912 Austrian General…

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