Mining machine feed drum control,申请号US19480052233-传众专利搜索

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发明名称	Mining machine feed drum control
摘要
申请公布号	US2543634(A)	申请公布日期	1951.02.27
申请号	US19480052233	申请日期	1948.10.01
申请人	THE JEFFREY MANUFACTURING COMPANY	发明人	LEE ARTHUR L.
分类号	E21C29/10	主分类号	E21C29/10
代理机构		代理人
主权项
地址

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