US PATENT SUBCLASS 73 / 755
.~.~ Pirani type

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

700  DF  FLUID PRESSURE GAUGE {20}
753  DF  .~ Electrical {2}
755.~.~ Pirani type

DEFINITION

Classification: 73/755

Pirani type:

(under subclass 753) Subject matter comprising a thermal conductivity of the medium (the pressure of which is to be measured) is measured as an index of such pressure.