340 / | HD | COMMUNICATIONS: ELECTRICAL |
825 | DF | SELECTIVE {23} |
825.57 | DF | .~ Pulse responsive actuation {5} |
825.62 | .~.~ Serial {5} | |
825.63 | DF | .~.~.~> Pulse width |
825.64 | DF | .~.~.~> Pulse spacing (e.g., pulse repetition rate) |
825.65 | DF | .~.~.~> Counting {2} |
825.68 | DF | .~.~.~> Shift register |
825.69 | DF | .~.~.~> Radio link |