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发明名称
摘要
申请公布号
JPS5640948(Y2)
申请公布日期
1981.09.25
申请号
JP19790098422U
申请日期
1979.07.16
申请人
发明人
分类号
E21B10/44;(IPC1-7):E21B10/44
主分类号
E21B10/44
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代理人
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