Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5528681 | Automatic dialing device and auxiliary dialing device for a telephone | Seizo Iwai, Tsuneko Iwai, Yumiko Kato | 1996-06-18 |
| 5325428 | Automatic switching-back device for telephone circuit | Seizo Iwai, Tsuneko Iwai, Yumiko Iwai | 1994-06-28 |