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公开(公告)号：EP2836335A4
公开(公告)日：2016-05-25
申请号：EP13775094
申请日：2013-04-08
Applicant: SMITH INTERNATIONAL
Inventor： MIDDLEMISS STEWART N , BAO YAHUA , CARTER LAN
CPC classification number: B30B15/34 , B01J3/067 , B30B11/004
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