Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5361855 | Method and casing for excavating a borehole | Kenneth W. Schuermann, James E. Franklin | 1994-11-08 |
| 5341887 | Directional multi-blade boring head | Cody L. Sewell | 1994-08-30 |