(under subclass 540) Subject matter wherein the detected condition is the presence or absence of a flame.
SEE OR SEARCH CLASS
137, Fluid Handling,
65, for a combustion failure fluid safety cutoff.
219, Electric Heating,
248, for a heating device combined with a sole plate-type pressure application means (e.g., a flatiron, etc.) including a condition-responsive indicator, subclass 445.1 for an exposed planar support surface for material to be heated (e.g., hot plate, etc.) including an indicator, or subclasses 446.1+ for an exposed planar support surface for material to be heated (e.g., hot plate, etc.) including a sensing means.
431, Combustion, 13, for combustion with indicator.
