US PATENT SUBCLASS 84 / 33
.~.~.~.~.~ Expression mechanism

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.~.~.~.~.~ Expression mechanism {8}
34  DF  .~.~.~.~.~.~> Parts of piano moved {1}
39  DF  .~.~.~.~.~.~> Wind pressure varied {4}
44  DF  .~.~.~.~.~.~> Two cooperating pneumatics to each note
45  DF  .~.~.~.~.~.~> Two opposing pneumatics to each note
46  DF  .~.~.~.~.~.~> Transmission varied
47  DF  .~.~.~.~.~.~> Systematic variations
48  DF  .~.~.~.~.~.~> Pneumatic details
49  DF  .~.~.~.~.~.~> Hand controllers

DEFINITION

Classification: 84/33

Miscellaneous devices for giving expression to the music.

(1) Note. In the art the term "expression" usually refers only to controlling the force of the blow. For tempo control see this class, subclass 128, etc.