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发明名称
摘要
申请公布号	FR2404758(B3)	申请公布日期	1981.07.24
申请号	FR19780028034	申请日期	1978.09.29
申请人	KUBOTA LTD	发明人
分类号	E21D20/00;E21D20/02;E21D21/00;(IPC1-7):F16B35/04	主分类号	E21D20/00
代理机构		代理人
主权项
地址

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