Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4301875 | Method for making holes and producing gas in coal seams | German Munding, Helmut Hopmann, Armin Sowa, Walter Terschuren | 1981-11-24 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4301875 | Method for making holes and producing gas in coal seams | German Munding, Helmut Hopmann, Armin Sowa, Walter Terschuren | 1981-11-24 |