Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5653292 | Method and apparatus for automatically controlling the soil penetration depth of zone tillage coulters and the like | Timothy J. Ptacek, Dan J. Obenland, Thomas O. McGuire | 1997-08-05 |