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发明名称
摘要
申请公布号
FR2057002(A7)
申请公布日期
1971.05.07
申请号
FR19700021373
申请日期
1970.06.10
申请人
CONTINENTAL OIL CY
发明人
分类号
E21B10/32;(IPC1-7):E21B9/00;E21B3/00
主分类号
E21B10/32
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