Original standard IEC 60050-531-1974 in PDF full version. Additional info + preview on request
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Original standard IEC 60050-531-1974 amd1-2017 in PDF full version. Additional info + preview on request
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Original standard IEC 60050-541-1990 in PDF full version. Additional info + preview on request
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Original standard IEC 60050-541-1990 amd1-2015 in PDF full version. Additional info + preview on request
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Original standard IEC 60050-551-1998 in PDF full version. Additional info + preview on request
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Original standard IEC 60050-551-20-2001 in PDF full version. Additional info + preview on request
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