Coal mining and loading apparatus,申请号US19480066080-传众专利搜索

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发明名称	Coal mining and loading apparatus
摘要
申请公布号	US2670944(A)	申请公布日期	1954.03.02
申请号	US19480066080	申请日期	1948.12.18
申请人	THE JEFFREY MANUFACTURING COMPANY	发明人	LEE ARTHUR L.
分类号	E21C25/68	主分类号	E21C25/68
代理机构		代理人
主权项
地址

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