US PATENT SUBCLASS 73 / 1.68
.~.~ With piston and cylinder

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}
1.68.~.~ With piston and cylinder

DEFINITION

Classification: 73/1.68

With piston and cylinder:

(under subclass 1.57) Subject matter including a cylindrical solid element movable in and snugly fitted in a cylindrical housing and wherein either (a) the apparatus for proving or calibrating the fluid pressure measuring device or the fluid pressure responsive device, (b) the device for measuring the fluid pressure, or (c) the device responsive to the fluid

pressure includes the solid element and the cylindrical housing.