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发明名称
Railway signaling system
摘要
申请公布号
US2294438(A)
申请公布日期
1942.09.01
申请号
US19410420371
申请日期
1941.11.25
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
ALLEN EARL M.
分类号
B61L21/06
主分类号
B61L21/06
代理机构
代理人
主权项
地址
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