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发明名称
摘要
申请公布号
JP2550045(Y2)
申请公布日期
1997.10.08
申请号
JP19910102951U
申请日期
1991.11.19
申请人
发明人
分类号
E02F3/39;E02F3/413;E21B11/04;(IPC1-7):E02F3/413
主分类号
E02F3/39
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代理人
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