Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4494894 | Extensible brattice support system for mine face ventilation | Edward F. Divers, Robert G. Behers | 1985-01-22 |
| 4282802 | Slideboard device for underground mine face ventilation | Edward F. Divers | 1981-08-11 |