Gear boxes for machines and structural parts therefor; motors for machines and structural parts therefor; electric motors for machines and structural parts therefor; gear motors for machines and structural parts therefor; electro-mechanical drives for machines and structural parts therefor; control mechanisms, namely electronic regulators, speed, and load controllers being component parts of machines, engines and motors; electro-mechanical drives and control apparatus, namely, electronic regulators, speed and load controllers being component parts of elevators; couplings for machines; mechanical drive elements for machines, namely, cogwheels, in the nature of spur gears, mitre gears and worm gears, steering racks and clutches