Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5273217 | Method and apparatus for improving the crushing action of demolition tools | Robert-Jan Bartels, Jurgen Winkler | 1993-12-28 |
| 5199658 | Dual-force hydraulic drive for a demolition tool | Robert-Jan Bartels, Hans-Dieter Piotrowski | 1993-04-06 |