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发明名称
Approach control apparatus for railway signaling systems
摘要
申请公布号
US2176605(A)
申请公布日期
1939.10.17
申请号
US19380223076
申请日期
1938.08.04
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
BLOSSER HERMAN G.
分类号
B61L23/16
主分类号
B61L23/16
代理机构
代理人
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地址
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