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| Keywords: Gymnasticon works unedited.png en Mechanism of the Gymnasticon invented by Francis Lowndes in 1797 The Repertory of Patent Inventions vol 6 published T and G Underwood 1797; http //books google com/books id FvU0AAAAMAAJ scanned copy at Google books Francis Lowndes 1797 Gymnasticon works edited png PD-old-100 Stationary bicycles History of technology | ||||
