Showing 1–14 of 14 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Thomas A. Mefferd | Columbus Mckinnon | 10 |
| 2 | Roy J. Mefferd | — | 6 |
| 3 | Robert O. Braesch | Columbus Mckinnon | 4 |
| #4 | Don S. Samuelson | Highway Equipment | 3 |
| #4 | Floyd R. Mefferd | — | 3 |
| #4 | Peter L. Hong | Columbus Mckinnon | 3 |
| #4 | Larry C. Mefferd | — | 3 |
| #8 | Kenneth Boughey | — | 2 |
| #8 | Kaye D. Van Genderen | Wells Enterprises | 2 |
| #10 | Paul S. Mefferd | — | 1 |
| #10 | John C. Ekstam | — | 1 |
| #10 | Dennis J. Lawman | — | 1 |
| #10 | Monty Leu | Zinpro | 1 |
| #10 | Scott L. Frye | — | 1 |
Part of Iowa