US PATENT SUBCLASS 73 / 865.2
HYDRAULIC ALTIMETER


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

865.2HYDRAULIC ALTIMETER


DEFINITION

Classification: 73/865.2

HYDRAULIC ALTIMETER:

(under the class definition) Subject matter for measuring the difference between a reference elevation and an unknown elevation by means of a pressure developed by a liquid.

(1) Note. The liquid is usually contained within a conduit extending from the higher to the lower elevation.

SEE OR SEARCH CLASS

33, Geometrical Instruments,

377, for liquid type horizontal or level determining devices and subclasses 366.15+ for a liquid type horizontal or level determining device with an electrically controlled indicator.