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发明名称
Railway signaling apparatus
摘要
申请公布号
US2222804(A)
申请公布日期
1940.11.26
申请号
US19390270819
申请日期
1939.04.29
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
SORENSEN ANDREW J.
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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