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发明名称
摘要
申请公布号
JPS6315432(Y2)
申请公布日期
1988.04.28
申请号
JP19830020001U
申请日期
1983.02.16
申请人
发明人
分类号
E21C37/02;(IPC1-7):E21C37/02
主分类号
E21C37/02
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代理人
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地址
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