| 178 / | HD | TELEGRAPHY |
| 2 R | DF | SYSTEMS {21} |
| 3 | DF | .~ Automatic {4} |
| 4 | DF | .~.~ Printing {1} |
| 4.1 R | ![]() | .~.~.~ Remote control {3} |
| 4.1 A | DF | .~.~.~.~> Radio-controlled |
| 4.1 B | DF | .~.~.~.~> Called station identification answer back system |
| 4.1 C | DF | .~.~.~.~> Revertive signaling |