US PATENT SUBCLASS 84 / 61-- .~.~.~.~.~.~.~ Inside

US PATENT SUBCLASS 84 / 61
.~.~.~.~.~.~.~ Inside

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}
50	DF	.~.~.~.~.~ Pneumatic construction {8}
60	DF	.~.~.~.~.~.~ Valves and seats {2}
61		.~.~.~.~.~.~.~ Inside

DEFINITION

Classification: 84/61

Patents for double valves the operating-surfaces of which face one another.