Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5670711 | Portable rock strength evaluation device | Andrew Drescher, David Allan Hultman | 1997-09-23 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5670711 | Portable rock strength evaluation device | Andrew Drescher, David Allan Hultman | 1997-09-23 |