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发明名称
Control means for highway crossing signals
摘要
申请公布号
US2051418(A)
申请公布日期
1936.08.18
申请号
US19300503555
申请日期
1930.12.19
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
PRESTON NEIL D.
分类号
B61L29/28
主分类号
B61L29/28
代理机构
代理人
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