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发明名称
摘要
申请公布号
JPS57123892(U)
申请公布日期
1982.08.02
申请号
JP19810008168U
申请日期
1981.01.22
申请人
发明人
分类号
E21B17/042;(IPC1-7):E21B17/042
主分类号
E21B17/042
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