Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4997317 | System and method for supporting a mining gallery | Burkhard Schonfeld, Werner Sonntag, Siegfried Sell, Herbert Niebuhr | 1991-03-05 |
| 4407043 | Under carriages for sliding doors having symmetrical weight distribution | — | 1983-10-04 |