Issued Patents 2019
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10484118 | Intercom system and communication control method | Takashi Yamamoto, Katsumi Nakagawa, Toshio Hayashi | 2019-11-19 |
| 10284357 | Intercom system and communication method thereof | Takashi Yamamoto, Katsumi Nakagawa, Toshio Hayashi | 2019-05-07 |