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发明名称
摘要
申请公布号	NL6815476(A)	申请公布日期	1969.05.02
申请号	NL19680015476	申请日期	1968.10.30
申请人		发明人
分类号	E01D21/00;(IPC1-7):E01D21/02	主分类号	E01D21/00
代理机构		代理人
主权项
地址

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