DIN EN ISO 15257:2017 Cathodic protection - Competence levels of cathodic protection persons - Basis for a certification scheme (ISO 15257:2017); German version EN ISO 15257:2017 has been changed from DIN EN 15257:2007 Cathodic protection - Competence levels and certification of cathodic protection personnel; English version of DIN EN 15257:2007-03.
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