(under subclass 722) Device having a zone wherein fuel is burned and having a catalyst in said zone to directly affect the burning reaction.
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39.46, for dissociation of a fuel or oxidizer by use of a catalyst prior to a combustion reaction.
299+, for catalytic treatment of the exhaust gases from a reciprocating piston-type internal combustion engine.
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422, Chemical Apparatus and Process Disinfecting, Deodorizing, Preserving, or Sterilizing, for catalytic apparatus for producing a chemical reaction in a gas for general utility.