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发明名称
摘要
申请公布号	NL7115762(A)	申请公布日期	1972.05.23
申请号	NL19710015762	申请日期	1971.11.16
申请人		发明人
分类号	E21C27/28;E21C35/06;E21D9/10;(IPC1-7):E21C33/00;E21C27/36;E21D9/00	主分类号	E21C27/28
代理机构		代理人
主权项
地址

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