Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872516 | Air driven impact operated ground piercing tool | Dirk A. Wilson | 1989-10-10 |
| 4809789 | Finned impact operating boring tool | — | 1989-03-07 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872516 | Air driven impact operated ground piercing tool | Dirk A. Wilson | 1989-10-10 |
| 4809789 | Finned impact operating boring tool | — | 1989-03-07 |