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发明名称
摘要
申请公布号
JPS6281693(U)
申请公布日期
1987.05.25
申请号
JP19850172768U
申请日期
1985.11.09
申请人
发明人
分类号
E21B10/00;(IPC1-7):E21B10/00
主分类号
E21B10/00
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代理人
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