Anti-friction bearings for machines; Bearing brackets for machines; Bearing cages being parts of machines; Bearing housings for machines; Bearing inserts for machines; Bearings for transmission shafts, being parts of machines; Machine parts, namely, bearings; Machine parts, namely, bearings and bushings; Machine parts, namely, roll mill bearings; Self-lubricating mechanical friction parts, especially of composite materials, namely, wear rings, washers, bushings, spherical bearings, bearing pa...