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发明名称
摘要
申请公布号
JPS5219363(B2)
申请公布日期
1977.05.27
申请号
JP19720078665
申请日期
1972.08.05
申请人
发明人
分类号
E02F5/00;E21C25/60;(IPC1-7):E21C25/60
主分类号
E02F5/00
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