IEC TR 60638-1979 Criteria for assessing and coding of the commutation of rotating electrical machines for traction《牵引用旋转电机换向的评定和确定等级准则》.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

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