318 / | HD | ELECTRICITY: MOTIVE POWER SYSTEMS |
560 | DF | POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23} |
671 | DF | .~ With particular motor control system responsive to the "actuating signal" {10} |
677 | DF | .~.~ With particular servoamplifier {5} |
681 | .~.~.~ Solid-state servoamplifiers |