Coal mining machine,申请号US19330682497-传众专利搜索

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发明名称	Coal mining machine
摘要
申请公布号	US1984832(A)	申请公布日期	1934.12.18
申请号	US19330682497	申请日期	1933.07.27
申请人	SAMUEL FRANCIS;RICHARD POWELL;LEE WELKER	发明人	HOWELL DAVID
分类号	E21C25/66	主分类号	E21C25/66
代理机构		代理人
主权项
地址

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