Showing 1–5 of 5 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | George W. Hall | Dittler Brothers Incorporated | 2 |
| 1 | Elmer K. Hansen | Dodgen Industries | 2 |
| 3 | Howard V. Stauffer | Valmont Industries | 1 |
| 3 | Robert A. Hoover | Able | 1 |
| 3 | Thomas C. Geelan | Broyhill | 1 |
Part of Iowa