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IEC 60059 Ed. 2.1 b:2009
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"IEC 60059:1999+A1:2009 is a consolidated version and consists of the second edition (1999) and and its amendment 1 (2009). The technical content is therefore identical to the base edition and its amendment and has been prepared for user convenience. This consolidated version consists of the second edition (1999) and its amendment 1 (2009). Therefore, no need to order amendment in addition to this publication. "
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International Electrotechnical Commission [iec]
International Electrotechnical Commission [iec]