Mining apparatus,申请号US19300461488-传众专利搜索

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发明名称	Mining apparatus
摘要
申请公布号	US1981746(A)	申请公布日期	1934.11.20
申请号	US19300461488	申请日期	1930.06.16
申请人	SULLIVAN MACHINERY COMPANY	发明人	OSGOOD CHARLES F.
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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