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发明名称
摘要
申请公布号
JPS5241561(B1)
申请公布日期
1977.10.19
申请号
JP19660052867
申请日期
1966.08.13
申请人
发明人
分类号
E21B3/04;E02F1/00;E21B3/00;(IPC1-7):E02D17/14
主分类号
E21B3/04
代理机构
代理人
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