Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4854058 | Dredging apparatus having a diver-operated hand-held dredge head for quasi-closed loop system | Albert H. Sloan | 1989-08-08 |
| 4807373 | Loop circuit dredging apparatus | Albert H. Sloan | 1989-02-28 |