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发明名称
摘要
申请公布号	SU448267(A1)	申请公布日期	1974.10.30
申请号	SU19711621000	申请日期	1971.02.15
申请人		发明人
分类号	E21B17/06;(IPC1-7):E21B17/06	主分类号	E21B17/06
代理机构		代理人
主权项
地址

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