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经营范围
发明名称
TRAFFIC CONTROLLING DEVICE
摘要
申请公布号
CA307437(A)
申请公布日期
1931.01.06
申请号
CAD307437
申请日期
申请人
THE GENERAL RAILWAY SIGNAL COMPANY
发明人
SEDGWICK N. WIGHT
分类号
主分类号
代理机构
代理人
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地址
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