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发明名称
摘要
申请公布号
JPS5934638(Y2)
申请公布日期
1984.09.25
申请号
JP19750082196U
申请日期
1975.06.17
申请人
发明人
分类号
E02D17/13;E02F5/02;E21B4/00;E21B4/18;(IPC1-7):E21B4/00
主分类号
E02D17/13
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