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发明名称
摘要
申请公布号
JPS5640950(Y2)
申请公布日期
1981.09.25
申请号
JP19770047328U
申请日期
1977.04.14
申请人
发明人
分类号
E21B19/08;E21B19/00;(IPC1-7):E21B19/08
主分类号
E21B19/08
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代理人
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