US PATENT SUBCLASS 318 / 615
.~.~ By auxiliary feedback loop

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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
611  DF  .~ With stabilizing features (e.g., anti-hunting, damping) {8}
615.~.~ By auxiliary feedback loop {1}
616  DF  .~.~.~> Rate feedback {2}

DEFINITION

Classification: 318/615

(under subclass 611) Subject matter in which the stabilizing means employees a separate auxiliary feedback loop in addition to the positional feedback loop.