Anti-friction bearings for machines; Bearing brackets for machines; Bearing cages being parts of machines; Bearing housings for machines; Bearing inserts for machines; Bearings, as parts of machines; Bearings for transmission shafts, being parts of machines; Couplings for machines; Engine bearings; Machine parts, namely, bearing housings; Machine parts, namely, bearings; Machine parts, namely, bearings and bushings; Machine parts, namely, roller bearings; Machine parts, namely, roll mill bearings; Roller bearings for machines; Self-lubricating mechanical friction parts, especially of composite materials, namely, wear rings, washers, bushings, spherical bearings, bearing pads, sliding blocks and machine transmission gears all for load bearing machines, conveyors, handling trucks and machines, lifting machines, agricultural machinery, construction equipment machines and hydraulic turbines; Shaft bearings for vacuum pumps; Shafts for pumps; Sliding bearings for machines; Spark plugs