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经营范围
发明名称
Mining machine
摘要
申请公布号
US1934813(A)
申请公布日期
1933.11.14
申请号
US19300419906
申请日期
1930.01.10
申请人
THE JEFFREY MANUFACTURING COMPANY
发明人
MULLER ERNST FCEDOR
分类号
E21C31/10
主分类号
E21C31/10
代理机构
代理人
主权项
地址
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