Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4330226 | Roof-support distancing apparatus | Josef Welzel, Hans Bull | 1982-05-18 |
| 4313698 | Hydraulic shield-type support | Gerhard Schorradt, Gunter Werth | 1982-02-02 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4330226 | Roof-support distancing apparatus | Josef Welzel, Hans Bull | 1982-05-18 |
| 4313698 | Hydraulic shield-type support | Gerhard Schorradt, Gunter Werth | 1982-02-02 |