Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4858210 | Apparatus with synthetic resin hand shaft | Wataru Yamada, Kenichi Nakamura | 1989-08-15 |
| 4785434 | Slip structure of a timepiece | Masaru Shoji, Wataru Yamada, Masayoshi Tanazawa, Mitsunobu Yatabe, Kenichi Nakamura +3 more | 1988-11-15 |