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发明名称
Color-light signal
摘要
申请公布号
US1785694(A)
申请公布日期
1930.12.16
申请号
US19220599361
申请日期
1922.11.06
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
DAY SALISBURY M.
分类号
B61L7/10
主分类号
B61L7/10
代理机构
代理人
主权项
地址
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