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经营范围
发明名称
Railway signaling apparatus
摘要
申请公布号
US2144432(A)
申请公布日期
1939.01.17
申请号
US19370179970
申请日期
1937.12.15
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
RYAN FRANCIS J.
分类号
B61L23/16
主分类号
B61L23/16
代理机构
代理人
主权项
地址
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