G01R 23/145
Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by heterodyning; by beat-frequency comparison {by heterodyning or by beat-frequency comparison with the harmonic of an oscillator}
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G01R 23/145
Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by heterodyning; by beat-frequency comparison {by heterodyning or by beat-frequency comparison with the harmonic of an oscillator}
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