Top Inventors at Hydro Systems International All Time
| Rank | Name | Patents |
|---|---|---|
| 1 | Frederick G. Stevens | 4 |
| 2 | Jerry B. Holden | 2 |
| 3 | Robert J. Heideman | 2 |
| #4 | Harry T. Cheatwood | 1 |
| #5 | Raymond M. Petrucci | 1 |
| #6 | Richard W. Crain | 1 |
| Rank | Name | Patents |
|---|---|---|
| 1 | Frederick G. Stevens | 4 |
| 2 | Jerry B. Holden | 2 |
| 3 | Robert J. Heideman | 2 |
| #4 | Harry T. Cheatwood | 1 |
| #5 | Raymond M. Petrucci | 1 |
| #6 | Richard W. Crain | 1 |