US PATENT SUBCLASS 318 / 683
.~.~ With particular phase discriminator

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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}
683.~.~ With particular phase discriminator

DEFINITION

Classification: 318/683

(under subclass 671) Subject matter in which the particular motor control includes a particular phase discriminator.

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608, for position servomechanisms using phase comparison.

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329, Demodulators,

103, and 110+, for particular phase demodulators or detectors.