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发明名称
摘要
申请公布号
JPH0577400(U)
申请公布日期
1993.10.22
申请号
JP19920016741U
申请日期
1992.03.27
申请人
发明人
分类号
E21F17/00;(IPC1-7):E21F17/00
主分类号
E21F17/00
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代理人
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地址
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