Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE32382 | Digging wheel for a suction dredger vessel | Johannes van den Elshout | 1987-03-31 |
| 4302893 | Digging wheel for a suction dredger vessel | Johannes van den Elshout | 1981-12-01 |