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发明名称
Method and apparatus for cooling mine air
摘要
申请公布号
US1878542(A)
申请公布日期
1932.09.20
申请号
US19310576857
申请日期
1931.11.23
申请人
RICHARDSON ALLAN S
发明人
RICHARDSON ALLAN S.
分类号
E21F3/00
主分类号
E21F3/00
代理机构
代理人
主权项
地址
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