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发明名称
RAILWAY TRAFFIC CONTROLLING SYSTEM
摘要
申请公布号
CA331659(A)
申请公布日期
1933.04.11
申请号
CAD331659
申请日期
申请人
THE GENERAL RAILWAY SIGNAL COMPANY
发明人
RAY PLANK;DARROL F. DELONG
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主分类号
代理机构
代理人
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