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发明名称
摘要
申请公布号
JP2781613(B2)
申请公布日期
1998.07.30
申请号
JP19890230059
申请日期
1989.09.05
申请人
发明人
分类号
E21C37/10;E21C37/08;(IPC1-7):E21C37/08
主分类号
E21C37/10
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