Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4834461 | Control system for a multiple shank impact ripper | John J. Krone, Michael A. Roussin | 1989-05-30 |
| 4823486 | Positive keeper means for pins of earthworking tips | Mark S. Diekevers | 1989-04-25 |