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New system of the bicycle to levers, with a pedal pivotally and reversible, with a constant traction and continuous and development and adjustable instantaneously at will, which is momentarily out of service all vehicles to advance the crank-gear
New system of the bicycle to levers, with a pedal pivotally and reversible, with a constant traction and continuous and development and adjustable instantaneously at will, which is momentarily out of service all vehicles to advance the crank-gear