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certificate of API 5L

certificate of API 5CT

Corporate Code Certificate

certificate of material supplier CNPC

certificate of OHSAS 18001:1999 standard

Certificate of Conformity of Quality Management System Certification

certificate of ISO14001:2004 standard

Certificate of Conformity of Occupational Safety and Health Management System Certification

certificate of ISO9001:2008standard

Certificate of Conformity of environment Management System Certification

certificate of API 5L seamless pipe

certificate of API 5CT seamless pipe

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Manufacture license of special equipment

Manufacture license of special equipment