TRANSMISSION COUPLINGS, CLUTCHES, MECHANICAL DRIVE UNITS UTILIZING GEARS OR CHAINS, ALL FOR USE WITH MACHINES, AND KEYS AND WEDGES FOR JOINING MACHINE ELEMENTS

TRANSMISSIONS AND PARTS THEREOF FOR MACHINES AND APPARATUS, REDUCING GEAR ARRANGEMENTS, TRANSMISSION COUPLINGS, CLUTCHES, KEYS AND WEDGES FOR JOINING MACHINE ELEMENTS, MECHANICAL DRIVES INCLUDING GEARS OR CHAINS