Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6731721 | Telephone exchange apparatus | Toshiaki Tanaka, Nobuhiro Masaki, Takashi Aoki | 2004-05-04 |
| 6243442 | Telephone exchange apparatus | Toshiaki Tanaka, Nobuhiro Masaki, Takashi Aoki | 2001-06-05 |
| 5825866 | Private electronic exchange apparatus having a plurality of extension terminals and office line terminals | Shinichi Honbou | 1998-10-20 |