US PATENT SUBCLASS 73 / 1.58
.~.~ Vacuum

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}
1.58.~.~ Vacuum

DEFINITION

Classification: 73/1.58

Vacuum:

(under subclass 1.57) Subject matter wherein either (a) the

apparatus for proving or calibrating the fluid pressure measuring device uses subatmospheric pressure or (b) the device being proven or calibrated is responsive to or measures a subatmospheric pressure.