Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6452081 | Stringed instrument finger positioning guide and method for teaching students to read music | Nicholas D. Ravagni, Patricia M. Ravagni | 2002-09-17 |
| 5920023 | Stringed instrument finger positioning guide and method for teaching students to read music | Patricia M. Ravagni | 1999-07-06 |