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发明名称
摘要
申请公布号
NL6802495(A)
申请公布日期
1968.08.28
申请号
NL19680002495
申请日期
1968.02.21
申请人
发明人
分类号
E21B17/07;E21B43/10;E21B49/00;E21B49/08;(IPC1-7):E21B23/00
主分类号
E21B17/07
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