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PCE
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CPC Subgroup
F01N 1/24

by using sound-absorbing materials (F01N1/04, F01N1/06, F01N1/10, F01N1/14, F01N1/16 take precedence)

Full Title

Silencing apparatus characterised by method of silencing > by using sound-absorbing materials (F01N1/04, F01N1/06, F01N1/10, F01N1/14, F01N1/16 take precedence)