Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4844661 | Method and device for driving tools into the ground | Andre Martin | 1989-07-04 |
| 4841149 | Device for detecting micro-leaks of gas by infrared radiations | Andre Martin | 1989-06-20 |