Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4327628 | Hydraulic roof support control system | Walter Weirich | 1982-05-04 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4327628 | Hydraulic roof support control system | Walter Weirich | 1982-05-04 |