Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5174387 | Method and apparatus for adapting the operational behavior of a percussion mechanism to the hardness of material that is being pounded by the percussion mechanism | Friedrich Arndt, Robert-Jan Bartels | 1992-12-29 |
| 5168753 | Measuring device for detecting parameters charterizing the operating behavior of hydraulic assembles | Friedrich Arndt, Robert-Jan Bartels | 1992-12-08 |
| 5060761 | Automatic lubricating device for the chisel of a hydraulic striking mechanism | Friedrich Arndt, Robert-Jan Bartels | 1991-10-29 |