Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4436448 | Excavating machine for tunnels and galleries | Otto Braach, Dirk Fischer, Werner Wippig | 1984-03-13 |
| 4264542 | Method of lining tunneled tubes | — | 1981-04-28 |
| 4209338 | Concrete for the lining of tunnel tubes | — | 1980-06-24 |