DIFF Subgroup
G01R 23/14 by heterodyning; by beat-frequency comparison
Introduced: September 1968
Full Title
Arrangements for measuring frequencies; Arrangements for analysing frequency spectra > Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage > by heterodyning; by beat-frequency comparison
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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