Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820458 | Process for continuously lining a tunnel with extruded concrete | Siegmund Babendererde, Otto Braach | 1989-04-11 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820458 | Process for continuously lining a tunnel with extruded concrete | Siegmund Babendererde, Otto Braach | 1989-04-11 |