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发明名称
RAILWAY SIGNAL CONTROL SYSTEMS
摘要
申请公布号
CA504706(A)
申请公布日期
1954.07.27
申请号
CAD504706
申请日期
申请人
THE UNION SWITCH AND SIGNAL COMPANY
发明人
WILLIAM H. CLAUS
分类号
主分类号
代理机构
代理人
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