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发明名称
Mining system
摘要
申请公布号
US2169424(A)
申请公布日期
1939.08.15
申请号
US19370129446
申请日期
1937.03.06
申请人
THE JEFFREY MANUFACTURING COMPANY
发明人
LEVIN NILS D.
分类号
E21C35/20
主分类号
E21C35/20
代理机构
代理人
主权项
地址
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