Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4981181 | Ram boring machine for laying service lines without excavation | — | 1991-01-01 |
| 4953626 | Ram boring machine having a pull-and-turn reversing gear | Franz-Josef Puttmann | 1990-09-04 |
| 4904116 | Apparatus for making tunnels in the ground and for laying supply lines | — | 1990-02-27 |