Power transmission unit with oscillating drive and driven member

Power transmission utilizing conversion of inertial forces

Propulsion and speed change mechanism for lever propelled bicycl

Ram drive for a cylindrical drum

Remotely controlled tool arm assembly

Reversible stepping actuator

Reversing drive

Rotary actuator mechanism

Rotary driving device

Rotary ratchet mechanism

Rotary stepper actuator

Rotary type driving device employing electromechanical transduce

Rotating and indexing mechanism

Selectively bi-directional tape feed mechanism

Shaft-turning device

Speed control apparatus for a bicycle

Spring motor for generating electrical energy

Stepping actuator

Stepping mechanism

Stepping mechanism