(under subclass 200) Subject matter including structural details of heating devices under the class definition combined with protective means whereby the heating unit is
prevented from overheating or is protected against damage due to external sources and wherein the heating device structure is not classifiable elsewhere above in the Class.
SEE OR SEARCH THIS CLASS, SUBCLASS:
322, for liquid heaters with protective means for the heater.
363, for fluid heaters of the convection type with protective means for the heater.
423, for crucible or furnace type apparatus with protective means for the heating unit or switch.
SEE OR SEARCH CLASS 307, Electrical Transmission or Interconnection Systems,
326+, for systems having self-protective, safety or limit control features and subclasses 116+ for condition responsive switches.
313, Electric Lamp and Discharge Devices,
11+, for discharge devices combined with temperature modification means.
338, Electrical Resistors, appropriate subclasses for electrical resistors, per se, with cooling or other protective means.
361, Electricity: Electrical Systems and Devices,
1+, for power systems with safety and protection devices.
