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发明名称
摘要
申请公布号
JPS5621082(U)
申请公布日期
1981.02.24
申请号
JP19790101967U
申请日期
1979.07.24
申请人
发明人
分类号
E02F3/06;E02D17/13;E02F3/18;E02F5/02;E02F5/04;E21B10/44;(IPC1-7):E21B10/44
主分类号
E02F3/06
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