Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5152583 | Continuous-operation extraction machinery for strip mining with a cylindrical extractor | Hartmut Grathoff | 1992-10-06 |
| 4562918 | En-mass conveyor for verticle or steep delivery of bulk material | Gunther Tschernatsch | 1986-01-07 |