US PATENT SUBCLASS 219 / 499
.~.~.~.~ Including bridge means


Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

200  DF  HEATING DEVICES {14}
482  DF  .~ With power supply and voltage or current regulation or current control means {4}
490  DF  .~.~ Automatic regulating or control means {11}
497  DF  .~.~.~ Comprising voltage and/or current measuring and comparing or combining means {2}
499.~.~.~.~ Including bridge means


DEFINITION

Classification: 219/499

(under subclass 497) Subject matter wherein the voltage or current measuring or comparison structure includes or comprises resistance or capacitance bridge means.

SEE OR SEARCH CLASS

318, Electricity: Motive Power Systems,

663+, position servo-mechanisms utilizing potentiometers as position measuring instruments, the potentiometers may take the form of a wheatstone bridge circuitry.