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

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.