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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
F01N 1/10

in combination with sound-absorbing materials (F01N1/125 takes precedence)

Full Title

Silencing apparatus characterised by method of silencing > by reducing exhaust energy by throttling or whirling > in combination with sound-absorbing materials (F01N1/125 takes precedence)