Issued Patents 1982
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4327628 | Hydraulic roof support control system | Michael Dettmers | 1982-05-04 |
| 4325659 | Mineral mining installation | Lubomir Plevak | 1982-04-20 |
| 4319772 | Hydraulic coupling device | Gunter Hennlich | 1982-03-16 |
| 4313463 | Pressure-relief valve device | — | 1982-02-02 |
| 4310027 | Hydraulic control devices for use with mining apparatus | — | 1982-01-12 |