| 318 / | HD | ELECTRICITY: MOTIVE POWER SYSTEMS |
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| 560 | DF | POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23} |
| 671 |  | .~ With particular motor control system responsive to the "actuating signal" {10} |
| 672 | DF | .~.~> Discontinuous or "on-off" control {2} |
| 675 | DF | .~.~> One transmitter or controller element follows another |
| 676 | DF | .~.~> Transmitter or controller element returned (e.g., force balance systems) |
| 677 | DF | .~.~> With particular servoamplifier {5} |
| 683 | DF | .~.~> With particular phase discriminator |
| 684 | DF | .~.~> With particular modulator or detector (e.g., choppers) |
| 685 | DF | .~.~> "Step-by-step" motors in closed-loop servos |
| 686 | DF | .~.~> Reciprocating or oscillating motors |
| 687 | DF | .~.~> Linear movement motors |
| 688 | DF | .~.~> Shaded pole motors |