US PATENT SUBCLASS 381 / FOR 131
.~ Gain Control (381/68.3)

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381 /   HD   ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES

FOR 127  DF  HEARING AIDS, ELECTRICAL (381/68) {15}
FOR 131.~ Gain Control (381/68.3)

DEFINITION

Classification: 381/FOR.131

Gain control:

Subject matter for varying the amount of amplification of the

output signal.