Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4823377 | System for setting registration mode for key telephone set | Ryuzo Sugiura, Kenichi Kanno | 1989-04-18 |
| 4794641 | Data transmission system of key telephone system | Kenichi Kanno, Senji Okumura | 1988-12-27 |
| 4731820 | Data transmission system of key telephone system | Kenichi Kanno, Senji Okumura | 1988-03-15 |