Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5973246 | Mute attached to brass instrument without change of pitch of sound | Shinji Hamanaga | 1999-10-26 |
| 5569864 | Mute attached to brass instrument without change of pitch of sound | Shinji Hamanaga | 1996-10-29 |