United States Patent 3214507
Inventors:
Williams, Richard E.
Publication Date:
10/26/1965
Other Classes:
84/724, 984/358
International Classes:
G10H3/06; G10H3/00
US Patent References:
| 3003383 | Percussion system | | | |
| 3073204 | Percussion system for an electronic musical instrument | | | |