Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4280735 | Non-rotary mining cutter with recessed nozzle insert | — | 1981-07-28 |
| 4243268 | Mineral mining installation with planer and jet carrier | Hans-Th. Grisebach | 1981-01-06 |
| 4198098 | Mineral winning installations | — | 1980-04-15 |