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IEC 61643-21 Amd.1 Ed. 1.0 b:2008
M00000690
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IEC 61643-21 Amd.1 Ed. 1.0 b:2008 Amendment 1 - Low voltage surge protective devices - Part 21: Surge protective devices connected to telecommunications and signalling networks - Performance requirements and testing methods
Amendment by International Electrotechnical Commission, 04/25/2008
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