Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5437500 | Tunneling machine with center cutter and debris removing means | Gebhard Lehmann, Rolf Heerssen | 1995-08-01 |
| 5184918 | Recoverable tunnelling machine | Werner Suhm, Rainer Griesbaum | 1993-02-09 |