(under the class definition) Device comprising means to sense the transmission of wave energy through natural media, and means responsive to the sensing means to impart to or permit movement of a closure.
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1+, for a closure with thermal release means.
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160, Flexible or Portable Closure, Partition, or Panel,
5, for a closure of that class responsive to variations in light intensity.
250, Radiant Energy, 336.1+, for a device for the detection and measurement of invisible radiation and subclasses 206+ for photocell controlled circuits.
307, Electrical Transmission or Interconnection Systems,
117, for a closure motor switching system controlled by radiant energy.
318, Electricity: Motive Power Systems,
16, for an electric closure motor controlled by a space transmitted electromagnetic or electrostatic energy, and subclasses 445+ for an electric closure motor controlled by other radiant energy sources.
361, Electricity: Electrical Systems and Devices,
173+, for a closure controlling relay responsive to radiant