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发明名称
摘要
申请公布号
JPH0136989(Y2)
申请公布日期
1989.11.09
申请号
JP19840035667U
申请日期
1984.03.13
申请人
发明人
分类号
E02D17/13;E02F5/02;E21B10/18;E21B10/44;E21B17/22;(IPC1-7):E02D17/13
主分类号
E02D17/13
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