Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4742328 | Audio and visual alarm device | Tatsuya Arai, Tadashi Ishii | 1988-05-03 |
| 4692741 | Motor actuated buzzer assembly with a plurality of leaf springs of different frequencies | Shigeo Shimoya, Yutaka Iwasaki, Tadashi Ishii | 1987-09-08 |
| 4599498 | Tamper switch | Shigeo Shimoya | 1986-07-08 |
| RE31152 | Alarm buzzer | Mitsuo Sakaguchi, Shigeo Shimoya | 1983-02-15 |