The authorization of explosion-proof certificate issuing agencies by the state has undergone strict and rigorous assessments. Not just for Nanyangcnex, ShanghainepsiTianjinpcecThe same applies to emerging explosion-proof certification institutions such as Shenchuan Institute, Beijing Coal Science Institute, Guangzhou Special Inspection Institute, etcCNASQualification assessment. The effectiveness of the explosion-proof certificate for each institution is the same.

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