Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4443134 | Yieldable roof support for mine passages and the like | Dietrich Willuhn, Horst Witte | 1984-04-17 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4443134 | Yieldable roof support for mine passages and the like | Dietrich Willuhn, Horst Witte | 1984-04-17 |