Issued Patents 2018
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9930442 | Sound production device for vehicle | Makoto Tsuruta | 2018-03-27 |
| 9868392 | Approaching vehicle warning speaker device | Kazuaki Watanabe, Junichi Sato, Makoto Tsuruta | 2018-01-16 |