Qualification certificate
Qualification certification
2019 CNOOC Huizhou Petrochemical Thank You Letter
Thank you letter for the 2020 China Russia East Gas Pipeline Project
Thank you letter from the second project department of Dingnan Pipeline Company in 2023
2019 China Petroleum Pipeline Thank You Letter
2017 China Petroleum Pipeline Material and Equipment Commendation Letter
Thank you letter from China Petroleum West East Pipeline Company in 2016
2009 China Petroleum Tianjin Branch Thank You Letter
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