Issued Patents 1994
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5346332 | Tubbing-type tunnel lining | Harald Wagner | 1994-09-13 |
| 5332334 | Tunnel wall with lining | Harald Wagner | 1994-07-26 |
| 5324139 | Method for the construction of long tunnel with a lining | Harald Wagner, Helmut Pfeil, Otto Schubert | 1994-06-28 |