| http://www.w3.org/ns/prov#value | - Apparatus of dual partially independent mechanism to propel bicycles or other vehicles, having a bottom bracket shell attached to a frame, a pair of main shafts mounted separately in said bottom bracket shell, a pair of propulsion levers supporting operating pedals, a pair of arcs each arc attached to each propulsion lever which is mounted on each main shaft, a pair of chains, each chain hooked wi
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