Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820458 | Process for continuously lining a tunnel with extruded concrete | Siegmund Babendererde, Otto Braach | 1989-04-11 |
| 4768898 | Process and apparatus for continuously lining a tunnel with extruded concrete | Siegmund Babendererde, Otto Braach | 1988-09-06 |
| 4621947 | Method of and apparatus for the lining of a tunnel with concrete | Siegmund Babendererde | 1986-11-11 |