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发明名称
摘要
申请公布号	NL6811642(A)	申请公布日期	1970.02.17
申请号	NL19680011642	申请日期	1968.08.15
申请人		发明人
分类号	E01F9/669;E01F15/04	主分类号	E01F9/669
代理机构		代理人
主权项
地址

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