7 Bearings, as parts of machines; Machine parts, namely, bearing housings; Machine parts, namely, bearing inserts; ball bearings for use in traction motors, crushers, shaker screens, and conveyor belts; ball rings for use in machines, namely, paper mills, oil field drills, rolling machines for paper mills; 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