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发明名称
摘要
申请公布号	FR2253913(B3)	申请公布日期	1977.08.26
申请号	FR19740039550	申请日期	1974.12.03
申请人	RUHRKOHLE AG	发明人
分类号	E21D11/15;(IPC1-7):E21D11/15	主分类号	E21D11/15
代理机构		代理人
主权项
地址

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