Lines with other classes and within this classRELATIONSHIP TO CLASSES INVOLVING, PER SE, FURNACES A. THE CLASSES OF ELECTRICAL HEATING: See Search Notes below for class of Industrial Electric Heating Furnaces, for furnace structure with characteristics limited to electric heating. See Search Notes below for class of Electric Heating, for electric heating characteristics including furnace structure. B. THE CLASSES OF HEATING: See Search Notes below for class of Stoves and Furnaces, provides for furnaces for ordinary domestic uses, cooking and heating stoves; fireplaces; and hot-air furnaces. See Search Notes below for class of Combustion, providing for furnaces for burning of gaseous or liquid fuel material, particularly for fluid-fed furnaces with or without other noncombustible fluids; and for a furnace in which the fluid fuel is fed tangentially to the wall of a circular combustion chamber. C. THE CLASSES OF PLASTIC AND PLASTIC TYPE MATERIAL SHAPING AND TREATING: See Search Notes below for class of Glass Manufacturing, provides for furnaces specially adapted for making glass, particularly for a glass melting furnace having a structurally defined delivery or refining zone; and for a glass annealing or tempering furnace including means to control the rate of cooling. See Search Notes below for class of Mineral Oils: Apparatus, for furnaces specially adapted for oil treatment. See Search Notes below for class of Metallurgical Apparatus, provides for furnaces specially adapted for metallurgical processes, particularly for furnaces treating ores or extracting metals, and for furnaces for melting or vaporizing metal. D. THE CLASSES OF PLANT AND ANIMAL HUSBANDRY: See Search Notes below for class of Butchering, for furnaces specially adapted for singeing hogs. RELATIONSHIP TO COMBINATION CLASSES A. THE CLASSES OF MISCELLANEOUS TREATING: See Search Notes below for class of Drying and Gas or Vapor Contact With Solids for a furnace combined with a chamber limited to drying work other than fuel or refuse. B. THE CLASSES OF HEATING: See Search Notes below for class of Liquid Heaters and Vaporizers for a furnace combined with a boiler, particularly for grates through which water circulates with or without connection to the boiler. See Search Notes below for class of Automatic Temperature and Humidity Regulation, provides for furnaces combined with automatic temperature and humidity regulators wherein the furnace or furnace structure is broadly recited or claimed, particularly for furnaces controlled by thermostats and humidistats. See Search Notes below for class of Heating, the residual class for a furnace combined with means for applying heat so as to treat material or work rather than for incinerating refuse or burning solid fuel for the production of transferable heat. C. THE CLASS OF PHYSICAL SEPARATION: See Search Notes below for class of Concentrating Evaporators, for furnaces combined with evaporator structure peculiar to the concentration of solids held in solution or suspension. D. THE CLASS OF COMMINUTING: See Search Notes below for class of Solid Material Comminution or Disintegration, for comminuting processes and apparatus in combination with furnaces to apply heat to the material. E. THE CLASSES OF VEHICLES: See Search Notes below for class of Railway Rolling Stock, for the combination of a furnace with a steam locomotive. RELATIONSHIP TO OTHER CLASSES A. THE CLASSES OF EARTHWORKING: See Search Notes below for class of Excavating for furnace devices for snow excavators and melters. B. THE CLASSES OF FLUID HANDLING: See Search Notes below for class of Excavating, Pipes and Tubular Conduits for furnace devices used in thawing pipes. C. THE CLASSES OF MOTORS, ENGINES, AND PUMPS: See Search Notes below for class of Power Plants for furnaces for burning solid fuel for the production of products of combustion intended to be used as a motive fluid. D. THE CLASS FOR DEALING WITH NONNUCLEAR HAZARDOUS OR TOXIC WASTE. See Search Notes below for class of Hazardous or Toxic Waste Destruction or Containment for the process of burning hazardous or toxic waste, and for the apparatus used in the treating of hazardous and toxic waste. | 
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