Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE33494 | Pick holding arrangements | Leslie W. Hindmarsh, Gerald Sanders | 1990-12-18 |
| 4711309 | Drilling apparatus | Samir R. Klat, Kenneth Unwin | 1987-12-08 |
| 4603911 | Pick holding arrangements | Leslie W. Hindmarsh, Gerald Sanders | 1986-08-05 |