Title:
Tone frequency control system for electronic musical instruments
United States Patent 3288904

Inventors:
George, Thomas J.
Publication Date:
11/29/1966
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Assignee:
HAMMOND ORGAN COMPANY
Primary Class:
84/674
Other Classes:
331/179, 84/DIG.002, 331/177R, 84/692, 984/309, 84/684, 84/704
International Classes:
G10H1/02
US Patent References:
2563477
2720133Apparatus for controlling frequency change
2918576Percussive circuit and assembly
3048719Electrical duty cycle control
3049959Obtaining ensemble and celeste effects in electrical musical instruments