Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5474364 | Shotgun cartridge rock breaker | Roger J. Morrell | 1995-12-12 |
| 5335977 | Double acting bit holder | Roger J. Morrell, David A. Larson | 1994-08-09 |
| 5123710 | Impact assisted segmented cutterhead | Roger J. Morrell, David A. Larson | 1992-06-23 |