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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
G01P 3/12

by making use of a system excited by impact

Full Title

Measuring linear or angular speed; Measuring differences of linear or angular speeds (G01P5/00 - G01P11/00 take precedence; ; counting mechanisms G06M) > Devices characterised by the use of mechanical means > by making use of a system excited by impact