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发明名称
摘要
申请公布号
NL7014012(A)
申请公布日期
1971.03.25
申请号
NL19700014012
申请日期
1970.09.22
申请人
发明人
分类号
E21B17/10;(IPC1-7):E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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