Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4479575 | Retaining device | Dieter Gr/u/ ndken, Reinhold Br/u/ ggemann, Manfred Redder | 1984-10-30 |
| 4445878 | Chain stripper devices and assemblies for mining machines | Josef Albers, Helmut Erwien | 1984-05-01 |
| 4437564 | Conveyor drive frame | Manfred Redder, Dieter Grundken, Helmut Temme | 1984-03-20 |
| 4389072 | Longwall mineral mining installation | Helmut Erwien, Herbert Beyer, Bodo Kerklies, Bernhard Wleklinski, Rudolf Mainusch +3 more | 1983-06-21 |