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发明名称
摘要
申请公布号
JP3064139(B2)
申请公布日期
2000.07.12
申请号
JP19930045017
申请日期
1993.03.05
申请人
发明人
分类号
E21B17/08;E21B7/20;E21D5/00;(IPC1-7):E21B7/20
主分类号
E21B17/08
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