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发明名称
摘要
申请公布号
JPS54116201(U)
申请公布日期
1979.08.15
申请号
JP19780012957U
申请日期
1978.02.04
申请人
发明人
分类号
E21B21/00;(IPC1-7):E21C7/00
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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