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发明名称
Apparatus for the control of highway-crossing signals
摘要
申请公布号
US1797302(A)
申请公布日期
1931.03.24
申请号
US19300438314
申请日期
1930.03.24
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
VANTASSEL HARRY C.
分类号
B61L29/28
主分类号
B61L29/28
代理机构
代理人
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地址
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