US PATENT SUBCLASS 370 / FOR 126
.~ Filtering techniques (370/123)

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370 /   HD   MULTIPLEX COMMUNICATIONS

FOR 122  DF  FREQUENCY DIVISION (370/69.1) {10}
FOR 126.~ Filtering techniques (370/123)

DEFINITION

Classification: 370/FOR.126

Filtering techniques:

Foreign art collection including subject matter in which devices that allow signals of certain frequencies to pass are employed for signal combination or separation in a frequency division multiplex system.