Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for

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In connection with safety belts or body harnesses in vehicles, control systems, alarms or interlock systems for the correct application of the belt or harness Indicating or measuring liquid level or level of fluent solid material, e.g. indicating by means of an alarm Alarms or signals in apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details are not special to particular types of pressure gauges Radiation-measuring instruments with provision for actuation of an alarm