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发明名称
摘要
申请公布号
JPH0731933(U)
申请公布日期
1995.06.16
申请号
JP19930064915U
申请日期
1993.11.11
申请人
发明人
分类号
E21B17/04;E02D3/12;E21B17/18;(IPC1-7):E02D3/12
主分类号
E21B17/04
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代理人
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