Issued Patents 1989
Showing 1–3 of 3 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 | Manfred Koppers, Lotar Sebastian | 1989-12-19 |
| 4843886 | Pressure measuring device | Manfred Koppers, Lothar Sebastian | 1989-07-04 |
| 4806017 | Apparatus for the contactless measurement of geometrical dimensions | Lothar Sebastian | 1989-02-21 |