Cushioned Patents (Class 213/7)
- Preliminary spring (Class 213/23)
- Springs only on draft (Class 213/25)
- Differential spring compression (Class 213/26)
- Rotating friction elements (Class 213/28)
- Interengaging friction springs (Class 213/29)
- Friction casings (Class 213/31)
- Central friction post (Class 213/35)
- Transversely movable friction element (Class 213/37)