Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D497935 | Adjustable trigger | Yuujirou Kamijima, Akihiko Fukuoka | 2004-11-02 |
| 6794569 | Acoustic instrument triggering device and method | Yuujirou Kamijima | 2004-09-21 |
| 6756535 | Electronic percussion instrumental system and percussion detecting apparatus therein | Kenji Hirano, Masato Katsuda | 2004-06-29 |
| D492342 | Drum trigger | Yuujirou Kamijima, Akihiko Fukuoka | 2004-06-29 |