Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5642463 | Stereophonic voice recording and playback device | Takahiko Nakano | 1997-06-24 |
| 5634085 | Signal reproducing device for reproducting voice signals with storage of initial valves for pattern generation | Shuichi Yoshikawa, Yuji Nishiwaki | 1997-05-27 |
| 5592544 | DTMF signal judging apparatus | Michio Ikeuchi, Shuichi Yoshikawa, Masahiko Watanabe | 1997-01-07 |