Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6234586 | Parking brake lock-in key switch system for vehicle air brake system | Richard B. Davis, Robert L. Douglas, Brad A. Hively, Terry E. Hively, Michael James Lehman | 2001-05-22 |
| 6007159 | Parking brake lock-in key switch system for vehicle air brake system | Richard B. Davis, Robert L. Douglas, Brad A. Hively, Terry E. Hively, Michael James Lehman | 1999-12-28 |