Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5754642 | Telephone terminal having multiple handsets | Yasuo Wada | 1998-05-19 |
| 5651061 | Telephone exchange system | Yasuo Wada | 1997-07-22 |
| 5471525 | Line status display system for telephone exchange system | Toshie Takahashi, Toshimi Kurumada | 1995-11-28 |
| 5404398 | Telephone exchange system | Yasuo Wada | 1995-04-04 |