,申请号NL19730011664-传众专利搜索

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发明名称
摘要
申请公布号	NL7311664(A)	申请公布日期	1974.02.26
申请号	NL19730011664	申请日期	1973.08.23
申请人		发明人
分类号	E21B21/00;E21B10/04;(IPC1-7):E21B9/16	主分类号	E21B21/00
代理机构		代理人
主权项
地址

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