Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4625631 | Method and apparatus for extending ventilation ductwork | — | 1986-12-02 |
| 4512610 | Mining system | Clark J. Gilbert, Menelaos D. Hassialis, Andrew H. Scrymgeour | 1985-04-23 |