Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4380064 | Digital audio signal control system for a timedivision switching system | Hiroshi Ishikawa, Takuhito Kojima | 1983-04-12 |
| 4370742 | Time division electronic switching system | Kiyoo Ozawa, Takashi Yokoto | 1983-01-25 |