GB/T 19001-2008/ISO 9001:2008
ISO 9001:2008
GB/T 19001-2008-ISO 9001:2008
ISO 9001:2008
Laboratory Accreditation Certificate
GB/T24001-2004
ALL9 PAGE 6 THE1/2 
  >Certificate
  >Honor
 
  ·API
 API casing and coupling
 API casing and coupling
·Non-API
 The casing & tubing of
 OTTM & OTTG series
 HGT casings
 Casings for heavy oil
 thermal exploration wells
 
 
 
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