Showing 1–6 of 6 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Curtis P. Thoreson | John Deere | 7 |
| 2 | Richard P. Borglum | — | 4 |
| 3 | Terry L. Erion | John Deere | 2 |
| #4 | William E. Stokes | John Deere | 1 |
| #4 | Donald Harby | John Deere | 1 |
| #4 | Ronald Robert Harms | Unknown | 1 |
Part of Iowa