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F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
F01N13/00—Exhaust or silencing apparatus characterised by constructional features
F01N13/06—Exhaust or silencing apparatus characterised by constructional features specially adapted for star-arrangement of cylinders, e.g. exhaust manifolds