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发明名称
摘要
申请公布号
JPS60154490(U)
申请公布日期
1985.10.15
申请号
JP19840042040U
申请日期
1984.03.23
申请人
发明人
分类号
E02F5/20;E21B7/00;E21B7/02;(IPC1-7):E21B7/02
主分类号
E02F5/20
代理机构
代理人
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