Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4912453 | Electromagnetic bell unit, its fitting structure and a method of welding the bell and the yoke of the unit | Satoru Yamauchi, Shoichiro Kumazawa, Natsuki Hashiba, Tomohiro Wada | 1990-03-27 |
| D304163 | Electromagnetic bell | Shoichiro Kumazawa, Satoru Yamauchi, Isao Kondo | 1989-10-24 |
| 4745682 | Method of connecting coil | Tsuyoshi Hayakawa, Isato Watanabe, Satoru Yamauchi, Isao Kondo | 1988-05-24 |