Issued Patents 1982
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4321967 | Suction of gases from boreholes in coal mining | Walter Stegmanns, Horst Weisner | 1982-03-30 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4321967 | Suction of gases from boreholes in coal mining | Walter Stegmanns, Horst Weisner | 1982-03-30 |