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发明名称
Signaling system
摘要
申请公布号
US2171756(A)
申请公布日期
1939.09.05
申请号
US19350014863
申请日期
1935.04.05
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
LEWIS LLOYD V.
分类号
B61L25/04
主分类号
B61L25/04
代理机构
代理人
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