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发明名称
Railway-traffic-controlling system
摘要
申请公布号
US1796342(A)
申请公布日期
1931.03.17
申请号
US19290334076
申请日期
1929.01.21
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
PENROD MELVIN A.
分类号
B61L3/08
主分类号
B61L3/08
代理机构
代理人
主权项
地址
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