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发明名称
摘要
申请公布号
JPS5779691(U)
申请公布日期
1982.05.17
申请号
JP19800156308U
申请日期
1980.10.30
申请人
发明人
分类号
E21B10/32;E21B10/44;(IPC1-7):E21B10/32
主分类号
E21B10/32
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