Issued Patents 1994
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5339909 | Apparatus for making earth bores | Gustav Jenne | 1994-08-23 |
| 5307883 | Method and apparatus for controlling a ramming device | — | 1994-05-03 |
| 5301758 | Method and apparatus for enlarging a bore hole | — | 1994-04-12 |
| 5288173 | Method for the directional control of an earth boring device as well as apparatus for making earth bores | Gustav Jenne | 1994-02-22 |