certificate of competency [经] 合格证书
- Company products mine country mechanical quality supervision and inspection center, Shanghai, Fushun electric explosion-proof examine standing and national coal the strict examination of the technological superintendent office
公司产品经国家采煤机械质量监督检测中心,上海、顺电气防爆检验站和国家煤炭技术监督部门的严格审查,颁发了防爆合格证书及煤矿矿用产品安全标志准用证。
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