Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4669560 | Continuous mining machine | Roger Dale Plumley | 1987-06-02 |
| 4646906 | Apparatus for continuously conveying coal from a continuous miner to a remote floor conveyor | Gopal Shah | 1987-03-03 |
| 4596424 | Continuous mining machine | Roger Dale Plumley | 1986-06-24 |
| 4341424 | Mobile dual auger continuous mining machine with multiple movement capabilities | Roger Dale Plumley | 1982-07-27 |