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All the pipes & tubes are subject to varied demanding inspections by:

1) Mill quality control division inspections with issuance of mill certs.& 3.1B
2) Third party inspections with issuance of 3.1 C certs by:
3) Certificates of Origin issued by CIQ and CCPIT:
 
地址：浙江省湖州市和孚镇长超工业园
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