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发明名称
摘要
申请公布号	SU560059(A1)	申请公布日期	1977.05.30
申请号	SU19731894156	申请日期	1973.03.21
申请人		发明人
分类号	E21B25/00;(IPC1-7):E21B25/00	主分类号	E21B25/00
代理机构		代理人
主权项
地址

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