US PATENT SUBCLASS 84 / 21
.~.~.~.~.~.~ With expression


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.~.~.~.~.~.~ With expression {1}
22  DF  .~.~.~.~.~.~.~> By voltage change


DEFINITION

Classification: 84/21

These patents include means for varying the force of the blow, usually electric resistances.