(under the class definition) Thermally-controlled discharge elements or outlets under the ... for extinguishing fluid, comprising a nozzle, a valve or closure member therefor, and means for normally holding the valve in closing position and automatically releasing or opening it upon an increase of temperature.
SEE OR SEARCH CLASS
239, Fluid Sprinkling, Spraying, and Diffusing, especially in the deflector subclasses (498, etc.), for spray nozzle or discharge members not automatically controlled. The patents in Class 239 may disclose but do not claim the fusible link.
