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发明名称
Apparatus for the control of highway crossing signals
摘要
申请公布号
US2195891(A)
申请公布日期
1940.04.02
申请号
US19370182824
申请日期
1937.12.31
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
MCCANN RONALD A.
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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