US PATENT SUBCLASS 84 / 22
.~.~.~.~.~.~.~ By voltage change

Current as of: June, 1999
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84 /   HD   MUSIC

1  DF  INSTRUMENTS {9}
*  DD  .~ Automatic {13}
7  DF  .~.~ Stringed {4}
13  DF  .~.~.~ Pianos {5}
19  DF  .~.~.~.~ Electric power {2}
20  DF  .~.~.~.~.~ Key actuators {1}
21  DF  .~.~.~.~.~.~ With expression {1}
22.~.~.~.~.~.~.~ By voltage change

DEFINITION

Classification: 84/22

Expression is secured by varying the voltage.