Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7172229 | Adjustable sifting shovel | — | 2007-02-06 |
| 5136528 | Maintenance and operational simulators | Donald S. Fordham, Richard A. Petersen | 1992-08-04 |
| 5067901 | Simulated multimeter | Donald S. Fordham, Richard A. Petersen | 1991-11-26 |