Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4272838 | Electronic watch module structure | Singo Ichikawa | 1981-06-09 |
| 4202166 | Solid state watch module construction | Katsuhiko Komiyama, Keiji Tsukamoto, Tomomi Murakami | 1980-05-13 |