340 / | HD | COMMUNICATIONS: ELECTRICAL |
825 | DF | SELECTIVE {23} |
825.57 | ![]() | .~ Pulse responsive actuation {5} |
825.58 | DF | .~.~> Phase or frequency shift keying |
825.59 | DF | .~.~> Polarity |
825.6 | DF | .~.~> Pulse pairs |
825.61 | DF | .~.~> Having delay line |
825.62 | DF | .~.~> Serial {5} |