Mechanical power transmission equipment for the energy industry, namely, gears, drives, gearboxes, gear housings, gear units, [ girth rings, presses, ] shafts, [ clutches, couplers, ] gear wheels, gear trains, gear clusters, pinions, differentials, [ gear racks, torque limiters, idlers, tighteners, sheaves, variable pitch sheaves, ] bearings, [ bearing seals, ] adaptor bearings, [ pillow blocks, flange blocks, take-up units, take-up frames, ] bushings, [ belts, flexible couplings, roller chain drives, sprockets, roller chains, pulleys, motor bases, chain tools, keys, set collars, hubs, keystock, ] speed reducers, geared sprockets, electrical adjustable speed drives, AC and DC electric motors not for land vehicles, [ clutches, clutch brakes, clutch brake couplings, ] antifriction bearings [, bearing seals, rubber belting in which cords are embedded, flexible link belting, synchronous drive belts, springs, pins, retainer rings and wire for maintaining a uniform air gap in electromagnetic friction clutches and brakes, ball screws, machinery shaft couplings, conveyor pulleys, and locking collars for antifriction bearing units ]

[ Repair and installation of mechanical power transmission devices and equipment ]