.~ Measuring or indicating drilling fluid (1) pressure, or (2) rate of flow
DEFINITION
Classification: 175/48
(under subclass 40) Subject matter relating to a drilling fluid system forming a part of the boring means and a step or means to (1) measure or indicate the pressure of the drilling fluid or (2) measure or indicate the rate of flow of said drilling fluid at a specified location in said system.
SEE OR SEARCH CLASS
73, Measuring and Testing,
290+, 700+ and 861+ for volume or rate of flow meters, liquid level or depth gauges, and fluid pressure gauges, respectively.
340, Communications: Electrical,
603+, for electrical automatic fluent material responsive indicating systems.