Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5002441 | Drilling unit | Dieter Dierich, Walter Rotter, Hermann Wilken | 1991-03-26 |
| 4913600 | Drilling unit | Dieter Dierich, Walter Rotter | 1990-04-03 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5002441 | Drilling unit | Dieter Dierich, Walter Rotter, Hermann Wilken | 1991-03-26 |
| 4913600 | Drilling unit | Dieter Dierich, Walter Rotter | 1990-04-03 |