Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872514 | Drive unit for driving ramming parts under water | — | 1989-10-10 |
| 4856938 | Method of and arrangement for separating tubular foundation piles under water | — | 1989-08-15 |
| 4817734 | Submergible electrohydraulic drive unit for ramming and working devices to be used under water | — | 1989-04-04 |
| 4818149 | Method of and a drive unit for driving ramming parts under water | — | 1989-04-04 |