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发明名称
RAILWAY TRAFFIC CONTROLLING APPARATUS
摘要
申请公布号
CA297650(A)
申请公布日期
1930.02.18
申请号
CAD297650
申请日期
申请人
THE UNION SWITCH AND SIGNAL COMPANY
发明人
ROBERT M. GILSON
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主分类号
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代理人
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