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经营范围
发明名称
Railway traffic controlling apparatus
摘要
申请公布号
US2237788(A)
申请公布日期
1941.04.08
申请号
US19380210744
申请日期
1938.05.28
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
NICHOLSON FRANK H.;ALLISON LESLIE R.
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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