Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4824289 | Sealing profile for tunnel segments | Werner Grabe | 1989-04-25 |
| 4797032 | Sealing profile | — | 1989-01-10 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4824289 | Sealing profile for tunnel segments | Werner Grabe | 1989-04-25 |
| 4797032 | Sealing profile | — | 1989-01-10 |