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发明名称
摘要
申请公布号
JPS5413361(Y2)
申请公布日期
1979.06.07
申请号
JP19750017001U
申请日期
1975.02.07
申请人
发明人
分类号
E21B10/38;E21B10/56;(IPC1-7):E21B9/00
主分类号
E21B10/38
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