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发明名称
摘要
申请公布号
JPS63108486(U)
申请公布日期
1988.07.13
申请号
JP19860199189U
申请日期
1986.12.29
申请人
发明人
分类号
E21B7/12;(IPC1-7):E21B7/12
主分类号
E21B7/12
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