| 370 / | HD | MULTIPLEX COMMUNICATIONS |
| 464 | DF | COMMUNICATION TECHNIQUES FOR INFORMATION CARRIED IN PLURAL CHANNELS {9} |
| 498 | DF | .~ Combining or distributing information via time channels {17} |
| 503 | DF | .~.~ Synchronizing {6} |
| 516 | ![]() | .~.~.~ Adjusting for phase or jitter {1} |
| 517 | DF | .~.~.~.~> Including delay device {2} |