Improvements in and relating to rock-drilling machines,申请号GB19380036530-传众专利搜索

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发明名称	Improvements in and relating to rock-drilling machines
摘要
申请公布号	GB522750(A)	申请公布日期	1940.06.26
申请号	GB19380036530	申请日期	1938.12.15
申请人	DUNCAN DE MAUX ROBERTSON	发明人
分类号	E21B21/02	主分类号	E21B21/02
代理机构		代理人
主权项
地址

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