US PATENT SUBCLASS 381 / 84
.~.~ Spare amplifier substitution

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}
84.~.~ Spare amplifier substitution

DEFINITION

Classification: 381/84

Spare amplifier substitution:

(under subclass 82) Subject matter having provision for substituting one amplifier for another.