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经营范围
发明名称
Centralized traffic controlling system for railroads
摘要
申请公布号
US2077619(A)
申请公布日期
1937.04.20
申请号
US19330687477
申请日期
1933.08.30
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
LONG DARROL F. DE;BRIXNER FREDERICK W.
分类号
B61L7/08
主分类号
B61L7/08
代理机构
代理人
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地址
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