Improvements in and relating to mining machines,申请号GB19380034931-传众专利搜索

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发明名称	Improvements in and relating to mining machines
摘要
申请公布号	GB523253(A)	申请公布日期	1940.07.10
申请号	GB19380034931	申请日期	1938.11.30
申请人	DWIGHT RICHARDS;SULLIVAN MACHINERY COMPANY	发明人
分类号	E21C35/20	主分类号	E21C35/20
代理机构		代理人
主权项
地址

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