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发明名称
Railway signaling system
摘要
申请公布号
US2155532(A)
申请公布日期
1939.04.25
申请号
US19380219243
申请日期
1938.07.14
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
DOWLING PHILIP H.
分类号
B61L23/16
主分类号
B61L23/16
代理机构
代理人
主权项
地址
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