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发明名称
Mining machine
摘要
申请公布号
US2334771(A)
申请公布日期
1943.11.23
申请号
US19390262764
申请日期
1939.03.18
申请人
THE JEFFREY MANUFACTURING COMPANY
发明人
JEFFREY ROBERT K.;MOON STERLING C.
分类号
E21C29/16
主分类号
E21C29/16
代理机构
代理人
主权项
地址
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