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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
F01L 7/08

with conically or frusto-conically shaped valves

Full Title

Rotary or oscillatory slide valve-gear or valve arrangements (slide valves with combined rotary and non-rotary movements, combinations of rotary and non-rotary slide valves F01L5/00) > with conically or frusto-conically shaped valves