Spring Wheels Patents (Class 152/1)
- With nonresilient overload stop (Class 152/18)
- Convertible to rigid wheel (Class 152/19)
- With flexible annular support (Class 152/20)
- Lateral thrust or tension (Class 152/21)
- Combined spring and friction (Class 152/28)
- With plural spring types (Class 152/29)
- Rubber spring (Class 152/40)
- Pneumatic spring (Class 152/53)
- Leaf spring (Class 152/69)
- Coil spring (Class 152/87)