Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880402 | Method and apparatus for preventing the attachment of foreign bodies to controllable pitch propeller linkages of watercraft | — | 1989-11-14 |
| 4860969 | Airborne body | Josef Nagler, Utz-Udo Ahlers | 1989-08-29 |