Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4881260 | Automatic telephone answering device with multiple outgoing messages and selecting means | — | 1989-11-14 |
| 4847895 | Controllable annunciator using ring signal | — | 1989-07-11 |
| 4835625 | Method of recording timing data generated by a central processing unit onto a tape for digital display | — | 1989-05-30 |
| 4825464 | Successive key operating mechanism for telephone dialing | — | 1989-04-25 |