| 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} |
| 489 | DF | .~.~ Bus (distributed stations) {1} |
| 490 | ![]() | .~.~.~ Combined communication of diverse information types |