Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D332095 | Intercommunication apparatus without a hand set | Derek Dennis | 1992-12-29 |
| D325381 | Telephone intercommunication set | Derek Dennis | 1992-04-14 |
| 4609284 | Device for exposing small originals in a reproduction camera | — | 1986-09-02 |