- Bearings, bushings, and blocks (7)
- Bearings, plain (3)
- Railroad car journal bearings (1)
- Joints and couplings (2)
- Couplings, shaft: rigid, flexible, universal joint, etc. (7)
- Chain, power transmission (2)
- Drives: belt, cable, or rope (1)
- Sprockets (power transmission equipment) (5)
- Clutches, except vehicular (5)
- Pulleys, power transmission (4)
