Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4476898 | Mine-roof support control means | Karl Krieger | 1984-10-16 |
| 4380410 | Mine-roof support | Hans Bull, Gerhard Ewich, Alfred Maykemper, Josef Welzel | 1983-04-19 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4476898 | Mine-roof support control means | Karl Krieger | 1984-10-16 |
| 4380410 | Mine-roof support | Hans Bull, Gerhard Ewich, Alfred Maykemper, Josef Welzel | 1983-04-19 |