US PATENT SUBCLASS 73 / 1.63
.~.~.~ With reference source or attachment therefor

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

1.01  DF  INSTRUMENT PROVING OR CALIBRATING {13}
1.57  DF  .~ Fluid pressure {7}
1.59  DF  .~.~ With signal correction or processing {3}
1.63.~.~.~ With reference source or attachment therefor {1}
1.64  DF  .~.~.~.~> Varying

DEFINITION

Classification: 73/1.63

With reference source or attachment therefor:

(under subclass 1.59) Subject matter including (a) a means for providing a standard or a known pressure during the proving or calibration of either the device which (1) measures fluid pressure or (2) is responsive to fluid pressure or (b) an element adapted to be affixed to a means for providing a standard or a known pressure during the proving or calibrating of the device which either (1) measures pressure or (2) is responsive to fluid pressure.