Bearing inserts for machines; Bearings for transmission shafts, being parts of machines; Bearings, as parts of machines; Engine bearings; Machine parts, namely, bearings and bushings; Machine parts, namely, roll mill bearings; Machine parts, namely, roller 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; Sliding bearings for machines