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发明名称
摘要
申请公布号
JPH0450495(U)
申请公布日期
1992.04.28
申请号
JP19900090338U
申请日期
1990.08.29
申请人
发明人
分类号
E21C35/18;(IPC1-7):E21C25/12
主分类号
E21C35/18
代理机构
代理人
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地址
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