Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8322375 | Control device and hydraulic pilot control | Frank Helbling, Gunter Fertig, Josef Hessdörfer, Burkhard Knoll | 2012-12-04 |
| 5036877 | Pilot controlled pressure relief valve | Josef Distler | 1991-08-06 |