US PATENT SUBCLASS 381 / 71.3
.~ From appliance

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

71.1  DF  ACOUSTICAL NOISE OR SOUND CANCELLATION {7}
71.3.~ From appliance

DEFINITION

Classification: 381/71.3

From appliance:

(under subclass 71.1) Subject matter wherein the noise cancellation system cancels noise emanating from a device such as an air conditioner, refrigerator, vacuum cleaner, etc.