Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5232268 | Method of breaking a full face of rock for constructing shafts and tunnels | William R. Dengler | 1993-08-03 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5232268 | Method of breaking a full face of rock for constructing shafts and tunnels | William R. Dengler | 1993-08-03 |