Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4936185 | Electronic musical instrument having plural component blocks | Yorihisa Yamaguchi, Hiroyuki Kawai, Naoya Tetsumura | 1990-06-26 |
| 4869701 | Electrical educational toy | Hiroyuki Kawai, Takeo Shibukawa | 1989-09-26 |