Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5171105 | Process and device for lining tunnels and ducts having circular and non-circular cross-sections, especially for canal and tunnel construction | — | 1992-12-15 |
| 5076729 | Tunnel-driving and support system | — | 1991-12-31 |
| 5051033 | Bracing device for a self-advancing shield tunnelling machine | — | 1991-09-24 |