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发明名称
Process of extracting useful elements from their ores by the aid of gases
摘要
申请公布号
US1759456(A)
申请公布日期
1930.05.20
申请号
US19270215508
申请日期
1927.08.25
申请人
BJARNE HOFSETH
发明人
HOFSETH BJARNE
分类号
E21C41/16
主分类号
E21C41/16
代理机构
代理人
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