Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4829571 | Headphone | Akinari Mori, Yoshio Ogawa | 1989-05-09 |
| 4668842 | Headphone | Yoshihiro Yokoyama, Yoshiyuki Kamon | 1987-05-26 |
| 4399334 | Speaker unit for headphones | Yoshiyuki Kamon | 1983-08-16 |