Top Inventors at Keystone Manufacturing All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Leonard A. Deni | 6 |
| 2 | Joseph A. Deni | 4 |
| 3 | Frank Deni | 1 |
| #4 | Larry P. Ulsh | 1 |
| #5 | Michael Etherington | 1 |
| Rank | Name | Patents |
|---|---|---|
| 1 | Leonard A. Deni | 6 |
| 2 | Joseph A. Deni | 4 |
| 3 | Frank Deni | 1 |
| #4 | Larry P. Ulsh | 1 |
| #5 | Michael Etherington | 1 |