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Continue to ChatIEC 60079-0 Edition 7.0 2017-12 CORRIGENDUM 1 https://exprofessional.com/2020/02/12/iec-60079-0-edition-7-0-2017-12-corrigendum-1/
IEC 60079-0 Edition 7.0 2017-12 CORRIGENDUM 1 https://exprofessional.com/2020/02/12/iec-60079-0-edition-7-0-2017-12-corrigendum-1/