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发明名称
Switch and signal control system for railroads
摘要
申请公布号
US2550859(A)
申请公布日期
1951.05.01
申请号
US19460669049
申请日期
1946.05.11
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
PICKELL CLARK A.
分类号
B61L19/06
主分类号
B61L19/06
代理机构
代理人
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地址
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