392, Electric Resistance Heating Devices, 324 for steam or vapor generator which is a fluid-in-circuit type heater, subclasses 386+ for heating device for use in converting a substance from a solid or liquid to a gaseous state (especially subclasses 394+ for evaporation device for substance which is a liquid (e.g., water, etc.)).
(324 for steam or vapor generator; is; a fluid-in-circuit type heater) (392, Electric Resistance Heating Devices, 324 for steam or vapor generator; subclasses; 386+ for heating device; for use in converting a substance from a solid or liquid to a gaseous state (especially subclasses 394+ for evaporation device for substance which is a liquid (e.g., water, etc.) (a solid or liquid to a gaseous state (especially subclasses 394+ for evaporation device for substance; is; a liquid)
324 for steam or vapor generator 392, Electric Resistance Heating Devices, 324 for steam or vapor generator a solid or liquid to a gaseous state (especially subclasses 394+ for evaporation device for substance
is subclasses is
a fluid-in-circuit type heater
386+ for heating device for use in converting a substance from a solid or liquid to a gaseous state (especially subclasses 394+ for evaporation device for substance which is a liquid (e.g., water, etc.
a liquid