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发明名称
摘要
申请公布号	FR2261404(B1)	申请公布日期	1982.05.28
申请号	FR19750005354	申请日期	1975.02.20
申请人	DEMAG AG	发明人
分类号	E21B7/02;E21B19/22;E21F17/04;(IPC1-7):E21B19/00	主分类号	E21B7/02
代理机构		代理人
主权项
地址

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