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发明名称
摘要
申请公布号
JPS52116808(U)
申请公布日期
1977.09.05
申请号
JP19760024381U
申请日期
1976.03.03
申请人
发明人
分类号
E01B9/68;(IPC1-7):E01B9/68
主分类号
E01B9/68
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代理人
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