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发明名称
摘要
申请公布号
JP3471453(B2)
申请公布日期
2003.12.02
申请号
JP19940317256
申请日期
1994.12.20
申请人
发明人
分类号
E21B7/00;E21B10/44;(IPC1-7):E21B7/00
主分类号
E21B7/00
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