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发明名称
Signaling system for railroads
摘要
申请公布号
US2122379(A)
申请公布日期
1938.06.28
申请号
US19350037744
申请日期
1935.08.24
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
PRESTON NEIL D.
分类号
B61L23/16
主分类号
B61L23/16
代理机构
代理人
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