Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4596496 | Mine roof supporting truss system | Robert W. Hill, Jerry E. Frease | 1986-06-24 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4596496 | Mine roof supporting truss system | Robert W. Hill, Jerry E. Frease | 1986-06-24 |