(under subclass 317) Indicator, sampler, or inspection feature wherein the condition or function is force per unit area exerted by a liquid or gas.
SEE OR SEARCH CLASS
73, Measuring and Testing, for a detailed structure or method for measuring or testing,
700+, for direct measurement of fluid pressure.
116, Signals and Indicators, for a specifically recited and detailed mechanical device for giving signals of the nature of an alarm or indicator that appeals to any one or more of the senses and combined with nominal apparatus structure from other classes,
70, for a fluid-pressure variation alarm giving audible indication usually operated automatically, or subclasses 266+ for a pressure indicator having means to convey information to one of the senses.
