Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4260857 | Office line connection circuit during service interruptions in key telephone apparatus | Tsuyoshi Shinoi | 1981-04-07 |
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4260857 | Office line connection circuit during service interruptions in key telephone apparatus | Tsuyoshi Shinoi | 1981-04-07 |