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发明名称
摘要
申请公布号
JPS5240561(Y1)
申请公布日期
1977.09.13
申请号
JP19670085095U
申请日期
1967.10.04
申请人
发明人
分类号
E21B7/00;E02F3/06;E21B7/02;(IPC1-7):E02F3/06
主分类号
E21B7/00
代理机构
代理人
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