Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4895480 | Method and apparatus for formation of a tunnel lining | Gert Jackel, Karl-Heinz Köhler | 1990-01-23 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4895480 | Method and apparatus for formation of a tunnel lining | Gert Jackel, Karl-Heinz Köhler | 1990-01-23 |