Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4391470 | Method of, and apparatus for, winning mineral material | Hans-Theodor Grisebach, Heinz Weinhold | 1983-07-05 |
| 4241824 | Conveyors for use in mineral mining installations | Werner Georg, Gerhard Merten | 1980-12-30 |