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发明名称
Mining machine
摘要
申请公布号
US2091416(A)
申请公布日期
1937.08.31
申请号
US19340716660
申请日期
1934.03.21
申请人
THE JEFFREY MANUFACTURING COMPANY
发明人
MITCHELL LEWIS E.
分类号
E21C31/00
主分类号
E21C31/00
代理机构
代理人
主权项
地址
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