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经营范围
发明名称
Mining machine
摘要
申请公布号
US1761670(A)
申请公布日期
1930.06.03
申请号
US19280267327
申请日期
1928.04.04
申请人
ROBERT HUGHES CHARLES
发明人
HUGHES CHARLES ROBERT
分类号
E21C31/02
主分类号
E21C31/02
代理机构
代理人
主权项
地址
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