US PATENT SUBCLASS 73 / 865.2
HYDRAULIC ALTIMETER
Current as of: June, 1999
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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.
