Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881853 | Support section for mines and tunnels | — | 1989-11-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881853 | Support section for mines and tunnels | — | 1989-11-21 |