| 2784631 | Tone control for stringed instruments | 1957-03-12 | ||
| 2741146 | Tremolo device for stringed instruments | 1956-04-10 | ||
| 2573254 | Combination bridge and pickup assembly for string instruments | 1951-10-30 | ||
| 2001392 | Method and apparatus for the production of music | 1935-05-14 |