US PATENT SUBCLASS 370 / FOR 129
.~.~ Connecting filters (370/72)

Current as of: June, 1999
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370 /   HD   MULTIPLEX COMMUNICATIONS

FOR 122  DF  FREQUENCY DIVISION (370/69.1) {10}
FOR 128  DF  .~ Subscriber carrier (370/71) {2}
FOR 129.~.~ Connecting filters (370/72)

DEFINITION

Classification: 370/FOR.129

Connecting filters:

Foreign art collection including subject matter in which arrangements of filters or filtering techniques are employed for signal combination or separation.