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发明名称
摘要
申请公布号
JP2532553(Y2)
申请公布日期
1997.04.16
申请号
JP19880160525U
申请日期
1988.12.10
申请人
发明人
分类号
E01B9/48;E01B11/24;(IPC1-7):E01B9/48
主分类号
E01B9/48
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