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经营范围
发明名称
Mining machine
摘要
申请公布号
US1946634(A)
申请公布日期
1934.02.13
申请号
US19300457327
申请日期
1930.05.29
申请人
THE JEFFREY MANUFACTURING COMPANY
发明人
MULLER ERNST F.
分类号
E21C25/24
主分类号
E21C25/24
代理机构
代理人
主权项
地址
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