Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5361855 | Method and casing for excavating a borehole | James E. Franklin, Arthur D. Deken | 1994-11-08 |
| 5212891 | Soft excavator | James E. Franklin, Arthur D. Deken | 1993-05-25 |
| 5070948 | Directional rod pusher | G. Edwin Malzahn | 1991-12-10 |
| 5039252 | Cable feed assembly for use with a vibratory plow | — | 1991-08-13 |