Original standard IEC 60235-4-1972 in PDF full version. Additional info + preview on request
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Original standard IEC 60235-4A-1975 in PDF full version. Additional info + preview on request
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Original standard IEC 60235-5-1972 in PDF full version. Additional info + preview on request
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Original standard IEC 60235-6-1972 in PDF full version. Additional info + preview on request
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Original standard IEC 60235-7-1972 in PDF full version. Additional info + preview on request
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Original standard IEC 60235-8-1972 in PDF full version. Additional info + preview on request
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