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Note: This standard has a new edition: IEC 60721-3-4:2019 ED3
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Revised
IEC 60721-3-4:1987 ED1
IEC 60721-3-4:1987/AMD1:1991 ED1
IEC 60721-3-4:1987/AMD2:1993 ED1
IEC 60721-3-4:1995 ED2
