Coal mining apparatus,申请号US19400323033-传众专利搜索

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发明名称	Coal mining apparatus
摘要
申请公布号	US2269781(A)	申请公布日期	1942.01.13
申请号	US19400323033	申请日期	1940.03.08
申请人	SULLIVAN MACHINERY COMPANY	发明人	OSGOOD CHARLES F.
分类号	E21C27/16	主分类号	E21C27/16
代理机构		代理人
主权项
地址

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