Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5101653 | Mechanical pipe expander | Rolf Hermes, Herbert Jansen, Arno Toputh | 1992-04-07 |
| 4537407 | Apparatus for testing pipes by a pipe tester | Herbert Jansen, Richard Gerretz | 1985-08-27 |