(under subclass 129) Systems provided with a device sensitive to the radiant energy generated by the load device for controlling the operation of the signal, indicator, or alarm means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
149, and indented subclasses, for systems not having indicators, etc., provided with a radiant energy sensitive device for controlling the operation of the load device.
SEE OR SEARCH CLASS
250, Radiant Energy,
200+, and the classes and subclasses specified in the Notes thereto for photocell control electric circuits and photocell apparatus.
337, Electricity: Electrothermally or Thermally Actuated Switches, 298+, for thermally responsive electric switches.
