US PATENT SUBCLASS 84 / 672
.~.~.~ Variable frequency

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
600  DF  .~ Electrical musical tone generation {5}
671  DF  .~.~ Electric analog oscillators {9}
672.~.~.~ Variable frequency {2}
673  DF  .~.~.~.~> With Variable filtering
674  DF  .~.~.~.~> With space discharging means

DEFINITION

Classification: 84/672

Variable frequency:

(under subclass 671) Subject matter wherein the oscillator is changed so that the discrete notes of a complete musical scale are obtained.