US PATENT SUBCLASS 318 / 642
.~.~ With liquid level measuring instruments

Current as of: June, 1999
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318 /   HD   ELECTRICITY: MOTIVE POWER SYSTEMS

560  DF  POSITIONAL SERVO SYSTEMS (E.G., SERVOMECHANISMS) {23}
638  DF  .~ With particular "error-detecting" means {13}
642.~.~ With liquid level measuring instruments

DEFINITION

Classification: 318/642

(under subclass 638) Subject matter in which the error detecting means is a liquid level measuring instrument.

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482, for open-loop automatic motor controls responsive to liquid level or level of a granular material.

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73, Measuring and Testing,

290+, for measuring and testing devices which measure liquid level.

340, Communications: Electrical, 612+, for electrical communication systems automatically responsive to the level of a fluent or pulverized material.