Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9437176 | Top-tuning system for hand percussion instrument | Richard Simons, Ray Enhoffer, Andrzej Krol | 2016-09-06 |
| 8609967 | Top-tuning system for hand percussion instrument | Richard Simons, Ray Enhoffer, Andrzej Krol | 2013-12-17 |