Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4624324 | Turning mechanism operating alternately in opposite directions to facilitate the driving in or extracting of piles | Hans Mathieu | 1986-11-25 |
| 4526242 | Drilling device | Hans Mathieu | 1985-07-02 |
| 4295759 | Device for the control of the internal pressure in a drill pipe for the construction of footings | Hans Mathieu | 1981-10-20 |