Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4823362 | Block synchronization data communication unit in mobile radio | — | 1989-04-18 |
| 4823373 | Line switching control system for mobile communication | Chusei Takahashi, Tadashi Amakasu | 1989-04-18 |