340 / | HD | COMMUNICATIONS: ELECTRICAL |
500 | DF | CONDITION RESPONSIVE INDICATING SYSTEM {6} |
501 | DF | .~ With particular system function (e.g., temperature compensation, calibration) {8} |
527 | DF | .~.~ Time delay {2} |
529 | .~.~.~ Condition persistence {1} | |
530 | DF | .~.~.~.~> Capacitor |