Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5025441 | Key telephone system | Masaharu Kamigaki, Yoshihiro Kawata, Nobuyasu Shiga, Hideharu Omori, Masayuki Kawashima +1 more | 1991-06-18 |
| 4782514 | Key telephone system | Hiroshi Fukushima, Teruo Matsufuji | 1988-11-01 |