Improvements in and relating to rock drills,申请号GB19550020208-传众专利搜索

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发明名称	Improvements in and relating to rock drills
摘要
申请公布号	GB777790(A)	申请公布日期	1957.06.26
申请号	GB19550020208	申请日期	1955.07.12
申请人	HELLEFORS BRUKS AKTIEBOLAG	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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