US PATENT SUBCLASS 381 / 100
.~.~ With active device
Current as of:
June, 1999
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381 /
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ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES
98
DF
INCLUDING FREQUENCY CONTROL
{3}
99
DF
.~ Having crossover filter {1}
100
.~.~ With active device
DEFINITION
Classification: 381/100
With active device:
(under subclass 99) Subject matter having an electrical or electronic element capable of controlling voltages or
currents to produce gain or switching action in a circuit (e.g., transistor, vacuum tube, or saturable reactor).