Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5603171 | Process and apparatus for suctioning off the solid material from waterbeds | — | 1997-02-18 |
| 5170576 | Cutting wheel arrangement for suction dredge | Heiko Stehmeier | 1992-12-15 |
| 4646449 | Bucket wheel dredging device | Ulrich Wantig | 1987-03-03 |