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View larger IEC 60050-721 Amd.2 Ed. 1.0 b:2017
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IEC 60050-721 Amd.2 Ed. 1.0 b:2017 Amendement 2 - International electrotechnical vocabulary - Part 721: Telegraphy, facsimile and data communication
Amendment by International Electrotechnical Commission, 08/30/2017