Pistons for automobile engines; hydraulic engines and motors; fan belts for motors and engines; pumps as parts of machines, motors and engines; taps being parts of machines, engines or motors; parallel tape being belts for machines, includes conveyor belts, conveyor belts, not including land vehicle engine belts; rubber track being parts of loading-unloading machines; flywheels for automobile engines; pulleys being parts of machines; bearings as parts of machines