US PATENT SUBCLASS 348 / 736
.~ Sound traps

Current as of: June, 1999
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348 /   HD   TELEVISION

725  DF  RECEIVER CIRCUITRY {10}
736.~ Sound traps

DEFINITION

Classification: 348/736

Sound traps:

(under subclass 725) Subject matter including apparatus at the receiver for substantially or totally eliminating frequencies at the frequency position of the sound signal.