(under subclass 233) Apparatus in which the cooled element is a part of a wall, floor, or roof of a heating chamber.
SEE OR SEARCH CLASS
122, Liquid Heaters and Vaporizers,
6, for a closed chamber or conduit conducting liquid to cool a wall, roof, or lining of utility in a broadly recited heating or combustion chamber organization.
373, Industrial Electric Heating Furnaces,
71+, 113+, 158, and 165 for an electrical furnace having means for cooling the furnace walls.
