Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4860282 | System for transmitting auxiliary signal in a multiplex communication system | Takayuki Ozaki | 1989-08-22 |
| 4799237 | Channel-system exchange system for digital data radio-communication system | — | 1989-01-17 |
| 4797903 | Channel switching system without instantaneous signal loss | — | 1989-01-10 |