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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
F01N1/00—Silencing apparatus characterised by method of silencing
F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
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FR58806D1948-11-181948-11-18Procédé et dispositif pour l'absorption des sons
ExpiredFR58806E
(fr)