US PATENT SUBCLASS 381 / 81
.~.~ With 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}
80  DF  .~ Multiple channel {1}
81.~.~ With switching

DEFINITION

Classification: 381/81

With switching:

(under subclass 80) Subject matter where there is the making, breaking or changing connections between audio signal paths.