Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880283 | Composite tread for track-laying vehicles | Gary P. Zeller, Martin D. Skirha | 1989-11-14 |
| 4844561 | Composite tread for track-laying vehicles | Gary P. Zeller, Martin D. Skirha | 1989-07-04 |