US PATENT SUBCLASS 84 / 42
.~.~.~.~.~.~.~ By regulating chamber

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}
24  DF  .~.~.~.~ Pneumatic type {10}
33  DF  .~.~.~.~.~ Expression mechanism {8}
39  DF  .~.~.~.~.~.~ Wind pressure varied {4}
42.~.~.~.~.~.~.~ By regulating chamber

DEFINITION

Classification: 84/42

The variation is due to the action of a variable chamber additional to the reservoir.