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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
A62C 3/04

for dust or loosely-baled or loosely-piled materials, e.g. in silos, in chimneys (flame traps A62C4/00)

Full Title

Fire prevention, containment or extinguishing specially adapted for particular objects or places ( ; for nuclear reactors G21C9/04) > for dust or loosely-baled or loosely-piled materials, e.g. in silos, in chimneys (flame traps A62C4/00)