Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4815543 | Activated rock cutting assembly | Dieter Lenzen | 1989-03-28 |
| 4796713 | Activated earth drill | Ulrich Bechem, Klaus Bechem | 1989-01-10 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4815543 | Activated rock cutting assembly | Dieter Lenzen | 1989-03-28 |
| 4796713 | Activated earth drill | Ulrich Bechem, Klaus Bechem | 1989-01-10 |