Issued Patents 1994
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5377188 | Communication system capable of detecting missed messages | — | 1994-12-27 |
| 5331647 | Communication apparatus having function to record communication history | Yasukuni Okataku, Shinsuke Tamura | 1994-07-19 |