Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5011433 | Multipole connector for control devices in underground working | Otmar Pfeiffer, Guy Geuns | 1991-04-30 |
| 4964675 | Method of electro-hydraulic control of longwall mine units | — | 1990-10-23 |
| 4505299 | 3-Port, 2-position directional control valve | Karl Krieger | 1985-03-19 |
| 4380410 | Mine-roof support | Hans Bull, Gerhard Ewich, Gunther Kuschke, Alfred Maykemper | 1983-04-19 |
| 4330226 | Roof-support distancing apparatus | Hans Bull, Alfred Maykemper | 1982-05-18 |