IEC 60235-2E-1976 Measurement of the electrical properties of microwave tubes Part 2 General measurements Fifth supplement Methods of measuring the influence o.pdf

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IEC TR 61241-2-2-1993 Electrical apparatus for use in the presence of combustible dust part 2 test methods section 2 method for determining the electrical resis.pdf

IEC TR 60972-1989 Classification and interpretation of new lighting products《新型照明产品的分类和说明》.pdf

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