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发明名称
摘要
申请公布号
FR1604429(A)
申请公布日期
1971.11.08
申请号
FRD1604429
申请日期
1968.12.24
申请人
发明人
分类号
E21B19/07;E21B19/10
主分类号
E21B19/07
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