Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4584784 | Method and device for maintaining tools at a level | Tjako A. Wolters, Cornelis J. Ravesteyn | 1986-04-29 |
| 4412790 | Balanced supplemental water bleed for suction dredgers | — | 1983-11-01 |