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发明名称
Sighting attachment for electric semaphore lamps
摘要
申请公布号
US1765865(A)
申请公布日期
1930.06.24
申请号
US19230624989
申请日期
1923.03.14
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
DAY SALISBURY M.
分类号
B61L5/18
主分类号
B61L5/18
代理机构
代理人
主权项
地址
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