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发明名称
摘要
申请公布号
JPH0428957(Y2)
申请公布日期
1992.07.14
申请号
JP19860053417U
申请日期
1986.04.09
申请人
发明人
分类号
E21B17/18;E21B21/00;(IPC1-7):E21B17/18
主分类号
E21B17/18
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