Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4303277 | Triangular shaped cutting head for use with a longwall mining machine | Sterling J. Anderson | 1981-12-01 |
| 4302053 | Mounting block to rotate coal cutter bits | Richard Wilson | 1981-11-24 |
| 4251109 | Dust controlling method using a coal cutter bit | — | 1981-02-17 |