(under subclass 654) Subject matter where the monitored circuit includes an electric heater.
SEE OR SEARCH THIS CLASS, SUBCLASS:
640, for monitoring the condition of a heater element.
SEE OR SEARCH CLASS
219, Electric Heating,
109, for a current supply indicator (e.g., a recorder, etc.) to a metal heating (e.g., resistance heating, etc.) pressure
bonding (e.g., resistance welding, etc.) apparatus, subclass 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, subclasses 446.1+ for an exposed planar support surface for material to be heated (e.g., hot plate, etc.) including a sensing means, subclass 487 for a heating device having a power supply and voltage or current regulation or current control means to control or regulate plural separate distinct heating resistance elements (i.e., one control system for all elements, etc.) selectively, sequentially, or alternately including indicator means, or subclass 506 for a heating device having automatic regulating or control means of power supply and voltage including signal or indicator means.
