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发明名称
摘要
申请公布号
JPS6332161(Y2)
申请公布日期
1988.08.29
申请号
JP19810035359U
申请日期
1981.03.16
申请人
发明人
分类号
E01B25/08;E01B25/10;(IPC1-7):E01B25/10
主分类号
E01B25/08
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代理人
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