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经营范围
发明名称
Railway track circuit and relay therefor
摘要
申请公布号
US2135528(A)
申请公布日期
1938.11.08
申请号
US19350030842
申请日期
1935.07.11
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
PRESTON NEIL D.
分类号
B61L1/18
主分类号
B61L1/18
代理机构
代理人
主权项
地址
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