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发明名称
摘要
申请公布号
NL7007024(A)
申请公布日期
1970.12.04
申请号
NL19700007024
申请日期
1970.05.14
申请人
发明人
分类号
E21B43/01;(IPC1-7):E02B15/04
主分类号
E21B43/01
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