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发明名称
Electrically operated signal system
摘要
申请公布号
US2224548(A)
申请公布日期
1940.12.10
申请号
US19380222360
申请日期
1938.08.01
申请人
MCFERRON ALFRED V
发明人
MCFERRON ALFRED V.
分类号
G08B13/22
主分类号
G08B13/22
代理机构
代理人
主权项
地址
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