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申请公布号
JPS57168593(U)
申请公布日期
1982.10.23
申请号
JP19810056683U
申请日期
1981.04.20
申请人
发明人
分类号
E21B7/18;E21D9/08;(IPC1-7):E21D9/08
主分类号
E21B7/18
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