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发明名称
摘要
申请公布号
JPS57147382(U)
申请公布日期
1982.09.16
申请号
JP19810034802U
申请日期
1981.03.11
申请人
发明人
分类号
E21B7/00;E21B3/00;(IPC1-7):E21B3/00
主分类号
E21B7/00
代理机构
代理人
主权项
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