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发明名称
Railway signaling system
摘要
申请公布号
US2178294(A)
申请公布日期
1939.10.31
申请号
US19380248689
申请日期
1938.12.31
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
YOUNG HENRY S.
分类号
B61L29/28
主分类号
B61L29/28
代理机构
代理人
主权项
地址
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