Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5247129 | Stringless piano-touch electric sound producer for directly driving a sound board on the basis of key actions | Kiyoshi Kawamura, Shigeru Muramatsu | 1993-09-21 |
| 5170000 | Sound board assembly for musical instruments | Hajime Hayashida, Toshiya Yamada, Akira Takemura | 1992-12-08 |
| 4924742 | Mechanical keyboard instrument with pedal mechanisms | Motoichi Numata, Hajime Hayashida, Toshiaki Sakai | 1990-05-15 |