Anti-friction bearings for machines; Ball transfer units; Bearings for transmission shafts, being parts of machines; Machine parts, namely, bearing housings; Machine parts, namely, bearings; Machine parts, namely, mandrels; Machine parts, namely, roller bearings; Pulleys being parts of machines; 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...