| 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 |