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发明名称
摘要
申请公布号
JPS5912316(Y2)
申请公布日期
1984.04.13
申请号
JP19790069362U
申请日期
1979.05.22
申请人
发明人
分类号
E21B12/06;E21B12/00;(IPC1-7):E21B12/00
主分类号
E21B12/06
代理机构
代理人
主权项
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