Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4947944 | Device for steering a drilling tool and/or drill string | Trevellyn M. Coltman, Bernhard Prevedel | 1990-08-14 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4947944 | Device for steering a drilling tool and/or drill string | Trevellyn M. Coltman, Bernhard Prevedel | 1990-08-14 |