Improvements in or relating to rock drills,申请号GB19490029943-传众专利搜索

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发明名称	Improvements in or relating to rock drills
摘要
申请公布号	GB693105(A)	申请公布日期	1953.06.24
申请号	GB19490029943	申请日期	1949.11.22
申请人	THOMAS LLEWELYN OWEN	发明人
分类号	E21B17/04	主分类号	E21B17/04
代理机构		代理人
主权项
地址

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