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发明名称
摘要
申请公布号
JP3721485(B2)
申请公布日期
2005.11.30
申请号
JP19980095047
申请日期
1998.04.07
申请人
发明人
分类号
E21B11/00;(IPC1-7):E21B11/00
主分类号
E21B11/00
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代理人
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