US PATENT SUBCLASS 318 / 647
.~.~ With magnetic field 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}
647.~.~ With magnetic field measuring instruments

DEFINITION

Classification: 318/647

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

SEE OR SEARCH CLASS

33, Geometrical Instruments,

355+, for geometrical instruments which measure magnetic fields.

324, Electricity: Measuring and Testing,

244, for electrical measuring and testing instruments which measure a magnetic field.