Improvements in coal getting machines,申请号GB19540019801-传众专利搜索

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发明名称	Improvements in coal getting machines
摘要
申请公布号	GB770423(A)	申请公布日期	1957.03.20
申请号	GB19540019801	申请日期	1954.07.06
申请人	BRITISH JEFFREY-DIAMOND LIMITED;ARTHUR YORKE SAVILLE	发明人	PEARSON DAVID
分类号	E21C31/00	主分类号	E21C31/00
代理机构		代理人
主权项
地址

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