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发明名称
Ventilating installation in tunnels
摘要
申请公布号
US2285387(A)
申请公布日期
1942.06.09
申请号
US19380184369
申请日期
1938.01.11
申请人
ALFRED BARTHOLOMAI
发明人
BARTHOLOMAI ALFRED
分类号
E21F1/00
主分类号
E21F1/00
代理机构
代理人
主权项
地址
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