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发明名称
Approach control apparatus for railroad block signaling systems
摘要
申请公布号
US2555013(A)
申请公布日期
1951.05.29
申请号
US19460680885
申请日期
1946.07.02
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
STAPLES CRAWFORD E.
分类号
B61L23/22
主分类号
B61L23/22
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