Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4734936 | Ringing signal sending-out circuit | Yoshiji Tanimoto, Masaaki Saito | 1988-03-29 |
| 4641337 | Key telephone system with means for operatively connecting another key telephone systems | Tetunobu Watanabe, Yoshiji Tanimoto, Minoru Okumura | 1987-02-03 |