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发明名称
摘要
申请公布号
JPS47810(U)
申请公布日期
1972.08.08
申请号
JP19710001236U
申请日期
1971.01.16
申请人
发明人
分类号
E01B9/34;E01B9/30;(IPC1-7):E01B9/30
主分类号
E01B9/34
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代理人
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