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发明名称
摘要
申请公布号
JP3193552(B2)
申请公布日期
2001.07.30
申请号
JP19930340418
申请日期
1993.12.08
申请人
发明人
分类号
E21B11/00;E21B15/00;(IPC1-7):E21B11/00
主分类号
E21B11/00
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