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经营范围
发明名称
CENTRALIZED TRAFFIC CONTROL SYSTEMS FOR RAILWAYS
摘要
申请公布号
CA484386(A)
申请公布日期
1952.06.24
申请号
CAD484386
申请日期
申请人
THE UNION SWITCH AND SIGNAL COMPANY
发明人
EARL M. ALLEN
分类号
主分类号
代理机构
代理人
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