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发明名称
摘要
申请公布号	FR1552599(A)	申请公布日期	1969.01.03
申请号	FRD1552599	申请日期	1968.01.31
申请人		发明人
分类号	E21C35/18;E21C35/19	主分类号	E21C35/18
代理机构		代理人
主权项
地址

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