4. Electricity: measuring and testing
  5. Measuring, testing, or sensing electricity, per se
  6. Frequency of cyclic current or voltage

Nikolai A. Rubichev

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Apparatus for automatic monitoring of superheterodyne radio rece

Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Patent

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Testing device for low-frequency amplifiers

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent

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Profile ID: LFUS-PAI-P-1525388

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