| Patents for E01B 3 - Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails (1,703) | |
|---|---|
| 11/1976 | |
| 11/30/1976 | US3994436 Composite railway tie |
| 04/1976 | |
| 04/06/1976 | US3948010 Reinforcing device for an element of prestressed concrete |
| 03/1976 | |
| 03/16/1976 | US3943818 Railroad tie |