Bearings, as parts of machines; self-lubricating bearings for machines; bushings, as parts of machines; bearing brackets for machines; bearing inserts and bearing housings for machines; engine bearings; roller bearings for machines; anti-friction bearings for machines; bearings for transmission shafts, being parts of machines; ball bearings for engines; shaft bearings for vacuum pumps; transmissions for machines; transmissions, other than for land vehicles