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CNOOC honored invention patent of^a kind of manufacturing method of N80 oil well casing pipe ̄
Addtime: 2012/09/22   Read1447    Font SizeLarge Small
  In June.27th,2012,CNOOC honored patent certificate of ^a kind of manufacturing method of N80 oil well casing pipe ̄ which was issued by State Intellectual Property Office of P.R.C, patent NO. was: ZL 2009 1 0157143.2.
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