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发明名称	IMPROVEMENTS IN DRILLS
摘要
申请公布号	GB8916171(D0)	申请公布日期	1989.08.31
申请号	GB19890016171	申请日期	1989.07.14
申请人	PAYNE, DAVID P	发明人
分类号		主分类号
代理机构		代理人
主权项
地址

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