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发明名称
RAILWAY SIGNALLING SYSTEM
摘要
申请公布号
CA407161(A)
申请公布日期
1942.09.01
申请号
CAD407161
申请日期
申请人
THE UNION SWITCH AND SIGNAL COMPANY
发明人
GEORGE A. CULBERTSON
分类号
主分类号
代理机构
代理人
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