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发明名称
摘要
申请公布号
JPS6266990(U)
申请公布日期
1987.04.25
申请号
JP19850154389U
申请日期
1985.10.11
申请人
发明人
分类号
E21C35/18;(IPC1-7):E21C25/12
主分类号
E21C35/18
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