Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4326103 | Coin telephone monitor circuit | — | 1982-04-20 |
| 4322708 | Electromagnetic device utilizing a pair of magnetically activated electronic switches | Frank J. Petkewicz | 1982-03-30 |