Issued Patents 1982
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4339153 | Apparatus for extending and retracting the cutter bars of a boring type mining machine | Earl C. Michael | 1982-07-13 |
| 4316635 | Extensible and retraciable rotor arm cutting assembly | Earl C. Michael | 1982-02-23 |