DIFF Main Group
G01R 23/00 Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
Introduced: September 1968
Of 3 combined children, 2 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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- G01R 23/02 Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage IPC+CPC Available in IPC and CPC