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发明名称
Apparatus for the control of highway-crossing signals
摘要
申请公布号
US1792835(A)
申请公布日期
1931.02.17
申请号
US19300436841
申请日期
1930.03.18
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
GRONDAHL LARS O.
分类号
B61L29/24
主分类号
B61L29/24
代理机构
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