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发明名称
摘要
申请公布号	FR2302411(B1)	申请公布日期	1978.09.29
申请号	FR19750006098	申请日期	1975.02.27
申请人	LORRAINE HOUILLERES DU BASSIN	发明人
分类号	E21D17/00;E21D17/05;E21D17/082;(IPC1-7):E21D17/05;E21D15/44	主分类号	E21D17/00
代理机构		代理人
主权项
地址

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