| 370 / | HD | MULTIPLEX COMMUNICATIONS |
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| 464 | DF | COMMUNICATION TECHNIQUES FOR INFORMATION CARRIED IN PLURAL CHANNELS {9} |
| 498 |  | .~ Combining or distributing information via time channels {17} |
| 499 | DF | .~.~> Polarity multiplex |
| 500 | DF | .~.~> Pilot |
| 501 | DF | .~.~> Repeater {1} |
| 503 | DF | .~.~> Synchronizing {6} |
| 521 | DF | .~.~> Time compression or expansion |
| 522 | DF | .~.~> Signaling (ancillary to main information) {6} |
| 529 | DF | .~.~> Information superimposed on other information |
| 530 | DF | .~.~> Staircase wave |
| 531 | DF | .~.~> Magnetic core for switching or storage |
| 532 | DF | .~.~> Multiplexer or distributor and technique for handling low level input signal |
| 533 | DF | .~.~> Multiplexer or distributor using pulse amplitude modulation |
| 534 | DF | .~.~> Multiplexer or distributor using electron beam switching device |
| 535 | DF | .~.~> Multiplexing combined with demultiplexing |
| 536 | DF | .~.~> Demultiplexing single signal into plural parallel channels (e.g., parallel transmission for increasing transmission speed) |
| 537 | DF | .~.~> Multiplexing plural input channels to a common output channel {2} |
| 542 | DF | .~.~> Demultiplexing single input channel to plural output channels {2} |
| 545 | DF | .~.~> Conversion of rate from a single input to a single output |