Showing 1–6 of 6 inventors
| Rank | Inventor | Primary Company | Patents |
|---|---|---|---|
| 1 | Paul J. Steffes | Steffes | 1 |
| 1 | Dan Johnson | — | 1 |
| 1 | Thomas G. Fisher | Tgr Construction | 1 |
| 1 | Thomas P. Steffes | Steffes | 1 |
| 1 | Austin P. Zeller | Steffes | 1 |
| 1 | Gregory L. Schafer | Tgr Construction | 1 |
Part of North Dakota