US PATENT SUBCLASS 73 / 701
.~ Null balance type

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

700  DF  FLUID PRESSURE GAUGE {20}
701.~ Null balance type

DEFINITION

Classification: 73/701

Null balance type:

(under subclass 700) Subject matter wherein the signal response of a pressure transducer to the pressure being measured is minimized or nullified by a counteracting force or signal, the magnitude of which is determined as an indication of the pressure.