4. Electricity: measuring and testing
  5. Measuring, testing, or sensing electricity, per se
  6. Balancing

Linus C. Ruth

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Cathode ray tube display error measurement apparatus and method

Electricity: measuring and testing – Electric lamp or discharge device – Cathode-ray tube
Patent

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Non-loading digital voltmeter

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Balancing
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Profile ID: LFUS-PAI-P-1479944

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