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PCE
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Search for IPC and CPC classification codes or keywords
DIFF Subgroup
F16K 17/1606

Full Title

Safety valves; Equalising valves, > opening on surplus pressure on one side; closing on insufficient pressure on one side (check valves F16K15/00) > with fracturing member > with fracturing diaphragm

Of 1 combined children, 0 exist in both systems.

1 codes are CPC-only extensions.