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发明名称
摘要
申请公布号	JPS5247168(B1)	申请公布日期	1977.11.30
申请号	JP19720023238	申请日期	1972.03.08
申请人		发明人
分类号	E21B17/08;E21B43/01;F16L1/15;F16L23/028;(IPC1-7):F17D1/00;F16L1/04	主分类号	E21B17/08
代理机构		代理人
主权项
地址

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