Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884852 | Double V-shaped endless track drive system | John W. Edwards, Daniel R. Harper | 1989-12-05 |
| 4861120 | Modular endless track drive system and methods of making, installing and repairing same | John W. Edwards, Daniel R. Harper | 1989-08-29 |
| 4844560 | Endless drive track joint assembly | John W. Edwards, Daniel R. Harper | 1989-07-04 |