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发明名称
CENTRALIZED TRAFFIC CONTROL SYSTEMS FOR RAILROADS
摘要
申请公布号
CA479393(A)
申请公布日期
1951.12.11
申请号
CAD479393
申请日期
申请人
THE UNION SWITCH AND SIGNAL COMPANY
发明人
FRANK T. PASCOE
分类号
主分类号
代理机构
代理人
主权项
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