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Sorry I don't know exactly how to do this, but the external link below is broken.
Web page of Asociación de Normalización y Certificación, A.C. (Association for Normalization and Certification), a Mexican entity, where the difference between NOM and NMX is explained. — Preceding unsigned comment added by 202.85.87.100 (talk) 02:02, 7 October 2020 (UTC)