Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7360725 | Material crusher | George F. Johnson, Jr. | 2008-04-22 |
| 5370218 | Apparatus for hauling coal through a mine | George F. Johnson, Jr. | 1994-12-06 |
| 4446626 | Method and apparatus for accurately setting directional headings in mining tunnels | George F. Johnson, Jr. | 1984-05-08 |