Mobile brattice machine and ramp for mines,申请号US19530341538-传众专利搜索

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发明名称	Mobile brattice machine and ramp for mines
摘要
申请公布号	US2738179(A)	申请公布日期	1956.03.13
申请号	US19530341538	申请日期	1953.03.10
申请人	JOY MANUFACTURING COMPANY	发明人	JOY JOSEPH F.
分类号	E21F1/10	主分类号	E21F1/10
代理机构		代理人
主权项
地址

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