Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5823126 | Mechanical seedling transplanter | Robert D. Kolk, Ken Kooiker, Brent Dykgraaf | 1998-10-20 |
| 4742785 | Planting machine with ground-conditioning drive | Robert D. Kolk | 1988-05-10 |
| 4658538 | Machine for forming wire arches, and installing the ends of the arches in the ground | Robert D. Kolk | 1987-04-21 |