Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE31987 | Automatic lamp bulb changer for signal lamps | Russell M. Hartung, Warren R. Alexander | 1985-09-17 |
| 4402038 | Automatic lamp bulb changer for signal lamps | Russell M. Hartung, Warren R. Alexander | 1983-08-30 |