(under subclass 104) The combination of a furnace with a mineral-oil vaporizer where the combination is designed to solve a problem peculiar to the art of mineral-oil distillation.
SEE OR SEARCH CLASS
110, Furnaces, for miscellaneous furnace structure alone.
122, Liquid Heaters and Vaporizers, for the combination of furnace with a closed liquid heater and vaporizer of general application.
126, Stoves and Furnaces,
344, for open water heaters.
264, Plastic and Nonmetallic Article Shaping or Treating: Processes,
30, for furnace lining formation or repair and see the notes thereto.
