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发明名称
摘要
申请公布号
JPS59192983(U)
申请公布日期
1984.12.21
申请号
JP19830087505U
申请日期
1983.06.08
申请人
发明人
分类号
E21B3/02;E21B3/00;E21B17/046;(IPC1-7):E21B17/046
主分类号
E21B3/02
代理机构
代理人
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