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发明名称
摘要
申请公布号	SU377473(A2)	申请公布日期	1973.04.17
申请号	SU19671184133	申请日期	1967.09.12
申请人		发明人
分类号	E21B7/28;(IPC1-7):E02D17/14;E21B9/26	主分类号	E21B7/28
代理机构		代理人
主权项
地址

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