Issued Patents 2020
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10757266 | Terminal device, and intercom system provided with terminal device | Seiya Yamakawa, Akira Kai | 2020-08-25 |
| 10659617 | Building controller and interphone system | Syu Kumagai | 2020-05-19 |
| 10616420 | Intercom system | Seiya Yamakawa, Hayato Takeya | 2020-04-07 |