Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5203461 | Mineral jig apparatus | Raymond A. Hanson | 1993-04-20 |
| 4999934 | Dredging apparatus | Raymond A. Hanson | 1991-03-19 |
| 4849097 | Cam actuated mineral jig | Raymond A. Hanson | 1989-07-18 |