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发明名称
摘要
申请公布号
JP3374277(B2)
申请公布日期
2003.02.04
申请号
JP19990067010
申请日期
1999.03.12
申请人
发明人
分类号
E21B19/00;E02D7/00;(IPC1-7):E21B19/00
主分类号
E21B19/00
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