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经营范围
发明名称
Railway block signaling apparatus
摘要
申请公布号
US2888553(A)
申请公布日期
1959.05.26
申请号
US19540420881
申请日期
1954.04.05
申请人
GENERAL RAILWAY SIGNAL COMPANY
发明人
FREEMAN SYDNEY W.
分类号
B61L1/18;B61L13/04
主分类号
B61L1/18
代理机构
代理人
主权项
地址
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