US PATENT SUBCLASS 381 / 80
.~ Multiple channel

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.~ Multiple channel {1}
81  DF  .~.~> With switching

DEFINITION

Classification: 381/80

Multiple channel:

(under subclass 77) Subject matter having more than one audio signal path.