Variable geometry linkage configuration

Variable leverage oil field pump jack

Variable mechanical vibrator

Variable moment vibrator usable for driving objects into the gro

Variable ratio bicycle drive mechanism

Variable ratio crank assembly

Variable ratio power transmission

Variable ratio power transmission means

Variable ratio rack and pinion gear

Variable ratio transmission

Variable speed change gear

Variable speed control

Variable speed control apparatus

Variable speed drive

Variable speed drive having intermediate alternating movements

Variable speed drive mechanism

Variable speed drive unit

Variable speed driving mechanism

Variable speed frictional drive transmissions

Variable speed linear actuator