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发明名称
Light signal
摘要
申请公布号
US2190526(A)
申请公布日期
1940.02.13
申请号
US19380223467
申请日期
1938.08.06
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
WELLS WESLEY B.
分类号
G08G1/095
主分类号
G08G1/095
代理机构
代理人
主权项
地址
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