(under subclass 317) Indicator, sampler, or inspection feature wherein the condition or function is escape or entry of fluid for the sealing means or chamber for the sealing means.
SEE OR SEARCH CLASS
73, Measuring and Testing, for a detailed structure or method for measuring or testing,
46+, for testing or determining leakage between parts mechanically fitted together and capable of being separated without destruction.
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,
109+, for a liquid level alarm giving audible indication usually operated automatically, subclass 112 for a fluid flow alarm giving audible indication usually operated automatically, or subclasses 227+ for a liquid level indicator having means to convey information to one of the senses.
