Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D304163 | Electromagnetic bell | Junichi Aizawa, Shoichiro Kumazawa, Satoru Yamauchi | 1989-10-24 |
| 4796239 | Circuit unit for timepiece and process for fabricating the same | Tsuyoshi Hayakawa, Satoru Yamauchi, Isato Watanabe | 1989-01-03 |