Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4812084 | Tubbing ring for lining a tunnel | Harald Wagner | 1989-03-14 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4812084 | Tubbing ring for lining a tunnel | Harald Wagner | 1989-03-14 |