US PATENT SUBCLASS 381 / 85
.~.~ Speaker or channel switching

Current as of: June, 1999
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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

77  DF  ONE-WAY AUDIO SIGNAL PROGRAM DISTRIBUTION {4}
82  DF  .~ Public address system {3}
85.~.~ Speaker or channel switching

DEFINITION

Classification: 381/85

Speaker or channel switching:

(under subclass 82) Subject matter having provision for changing audio signal paths or audio reproducers.