US PATENT SUBCLASS 318 / 644
.~.~ With flow 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}
644.~.~ With flow measuring instruments

DEFINITION

Classification: 318/644

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

SEE OR SEARCH CLASS

73, Measuring and Testing,

861+, for measuring and testing devices employing flow measuring instruments.

340, Communications: Electrical,

606+, for electrical communication systems automatically responsive to flow of fluent or pulverized material.