Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5259464 | Percussion mechanism for a drill rod unit | Robert-Jan Bartels | 1993-11-09 |
| 5199658 | Dual-force hydraulic drive for a demolition tool | Robert-Jan Bartels, Helmar Nafe | 1993-04-06 |
| 5129466 | Hydraulically operated striking mechanism | Robert-Jan Bartels | 1992-07-14 |
| 5117921 | Hydraulically operated hammer drill | Robert-Jan Bartels | 1992-06-02 |