Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4890332 | Apparatus for judging quality of mobile data communication | — | 1989-12-26 |
| 4823373 | Line switching control system for mobile communication | Tadashi Amakasu, Hiroshi Etoh | 1989-04-18 |