Improvements in drill dust removing devices for use at mining, quarrying and at similar work,申请号GB19490028303-传众专利搜索

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发明名称	Improvements in drill dust removing devices for use at mining, quarrying and at similar work
摘要
申请公布号	GB667306(A)	申请公布日期	1952.02.27
申请号	GB19490028303	申请日期	1949.11.04
申请人	HERMANN HEMSCHEIDT	发明人
分类号	E21B21/07	主分类号	E21B21/07
代理机构		代理人
主权项
地址

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