DIFF Subgroup
G01H 3/04 Frequency
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Measuring vibrations by using a detector in a fluid > Frequency
CPC:
Measuring vibrations by using a detector in a fluid (G01H7/00, G01H9/00, G01H11/00 take precedence) > Frequency
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
Child Classifications
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- G01H 3/08 Analysing frequencies present in complex vibrations, e.g. comparing harmonics present IPC+CPC Available in IPC and CPC