Power driven snow cycle

Power driven snow cycle with self adjusting frame

Power transmission device

Power transmission device

Power transmission means with adjustable fulcrum

Power transmission system for a bicycle

Power transmission unit for a motorcycle

Power unit adapted to bicycles

Proof that calf contractions cannot augment pressure on the...

Proof that contraction of the calf cannot increase pressure...

Proof that the contraction of the calf cannot increase...

Propulsion and speed change mechanism for lever propelled...

Propulsion mechanism with two independent actuators

Propulsion system for a man powered vehicle and the like

Propulsion system for a scooter

Propulsion system for a snow going device

Propulsion unit for skiers

Pulling type driving mechanism for a vehicle