Top Inventors at Preferred Machining All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Clinton W. Rutledge | 5 |
| 2 | Roger L. Kobak | 5 |
| 3 | Gary L. Yount | 3 |
| #4 | James S. Stirbis | 3 |
| #5 | William W. Weil | 3 |
| #6 | Tracy Jay Fowler | 2 |
| #7 | Ian Buckley | 1 |
| #8 | Michael Godfrey | 1 |
| #9 | William J. Keener | 1 |