Anti-friction bearings for machines; Ball transfer units; Bearing brackets for machines; Bearing inserts for machines; Bearings for transmission shafts, being parts of machines; Engine bearings; Machine parts, namely, bearing housings; Machine parts, namely, bearings; Machine parts, namely, bearings and bushings; Machine parts, namely, roll mill bearings; Roller bearings for machines; Self-lubricating mechanical friction parts, especially of composite materials, namely, wear rings, washers, b...