Mining machine head,申请号US19500173206-传众专利搜索

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发明名称	Mining machine head
摘要
申请公布号	US2562841(A)	申请公布日期	1951.07.31
申请号	US19500173206	申请日期	1950.07.11
申请人	COMPTON CHARLES E	发明人	COMPTON CHARLES E.
分类号	E21C25/58	主分类号	E21C25/58
代理机构		代理人
主权项
地址

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