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发明名称
摘要
申请公布号
JPS474882(Y1)
申请公布日期
1972.02.21
申请号
JP19690007220U
申请日期
1969.01.29
申请人
发明人
分类号
(IPC1-7):E21C19/02
主分类号
(IPC1-7):E21C19/02
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代理人
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地址
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