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Business License
API6D
TS
ISO 18001
ISO 14001
ISO 9001
CE
Business License-Chinese
API607,Size 4''~8'',Class600~Class900
API607 Size:8”and Large Class150.Class300
API607 Size“2”and below ,2-1/2”,3”4” Class1500.Class2500
China Gas Association
China District Heating Association
API6D
200601

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