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发明名称
Breathershaft safety ventilating system
摘要
申请公布号
US2679795(A)
申请公布日期
1954.06.01
申请号
US19500163906
申请日期
1950.05.24
申请人
JOSEF GEIGER;GEIGER EUGENE J
发明人
GEIGER JOSEF;GEIGER EUGENE J.
分类号
E04F17/04;F24F7/00;F24F7/06
主分类号
E04F17/04
代理机构
代理人
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地址
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