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经营范围
发明名称
LIGHT SIGNAL FOR RAILWAYS
摘要
申请公布号
CA341500(A)
申请公布日期
1934.05.08
申请号
CAD341500
申请日期
申请人
THE GENERAL RAILWAY SIGNAL COMPANY
发明人
OSCAR S. FIELD
分类号
主分类号
代理机构
代理人
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