Bearing housings for machines; Bearings, as parts of machines; Conveyor lines; Anti-friction bearings for machines; Belt conveyors; Bushing assembly for conveyor pulleys; Machine parts, namely, bearing housings; Machine parts, namely, bearing inserts; Machine parts, namely, bearings; Machine parts, namely, bearings and bushings; Machine parts, namely, mechanical seals; Roller conveyors; 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