power-driven at single endless flexible member, e.g. chain, between cycle crankshaft and wheel axle, the motor engaging the endless flexible member

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Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor > Rider propelled cycles with auxiliary electric motor > power-driven at single endless flexible member, e.g. chain, between cycle crankshaft and wheel axle, the motor engaging the endless flexible member