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发明名称
摘要
申请公布号
JPS57160388(U)
申请公布日期
1982.10.08
申请号
JP19810048421U
申请日期
1981.04.02
申请人
发明人
分类号
E21B1/26;E21B1/00;(IPC1-7):E21C3/20
主分类号
E21B1/26
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