| 318 / | HD | ELECTRICITY: MOTIVE POWER SYSTEMS |
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| 560 | DF | POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23} |
| 638 |  | .~ With particular "error-detecting" means {13} |
| 639 | DF | .~.~> Plural, diverse conditions |
| 640 | DF | .~.~> Photoelectric or optical-type measuring instruments |
| 641 | DF | .~.~> With particular temperature measuring instrument |
| 642 | DF | .~.~> With liquid level measuring instruments |
| 643 | DF | .~.~> With moisture content or wetness measuring instruments |
| 644 | DF | .~.~> With flow measuring instruments |
| 645 | DF | .~.~> With fluid pressure measuring instruments |
| 646 | DF | .~.~> With force or weight measuring instruments |
| 647 | DF | .~.~> With magnetic field measuring instruments |
| 648 | DF | .~.~> With inertial, direction or inclination measuring instrument {1} |
| 650 | DF | .~.~> With current, voltage or electrical power measuring instruments |
| 651 | DF | .~.~> With acceleration measuring instruments |
| 652 | DF | .~.~> With particular position measuring instruments {7} |