370 / | HD | MULTIPLEX COMMUNICATIONS |
464 | DF | COMMUNICATION TECHNIQUES FOR INFORMATION CARRIED IN PLURAL CHANNELS {9} |
480 | DF | .~ Combining or distributing information via frequency channels {11} |
485 | .~.~ Subscriber carrier {2} | |
486 | DF | .~.~.~> Program distribution {1} |
488 | DF | .~.~.~> Connecting filters |