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发明名称
Controlling apparatus for highway crossing signals
摘要
申请公布号
US2133171(A)
申请公布日期
1938.10.11
申请号
US19360062968
申请日期
1936.02.08
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
LAY CHARLES H.
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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