Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887935 | Method of controlling the movement of a longwall excavation front, especially the face or breast of a coal seam | Lotar Sebastian, Kuno Guse | 1989-12-19 |
| 4843886 | Pressure measuring device | Lothar Sebastian, Kuno Guse | 1989-07-04 |