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发明名称
Perforeringsanordning
摘要
申请公布号
NO970979(A)
申请公布日期
1997.09.09
申请号
NO19970000979
申请日期
1997.03.04
申请人
WESTERN ATLAS INTERNATIONAL INC
发明人
CHAWLA, MANMOHAN S.;REESE, JAMES W.
分类号
E21B43/117;F42B1/02;(IPC1-7):E21B43/117
主分类号
E21B43/117
代理机构
代理人
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地址
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