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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
F02B 23/04

the combustion space being subdivided into two or more chambers (with pre-combustion chambers F02B19/00)

Full Title

Other engines characterised by special shape or construction of combustion chambers to improve operation (engines with incandescent chambers F02B9/08) > with compression ignition > the combustion space being subdivided into two or more chambers (with pre-combustion chambers F02B19/00)