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发明名称
LIGHTOUT PROTECTION FOR RAILWAY SIGNALING SYSTEMS
摘要
申请公布号
CA479398(A)
申请公布日期
1951.12.11
申请号
CAD479398
申请日期
申请人
THE UNION SWITCH AND SIGNAL COMPANY
发明人
CRAWFORD E. STAPLES
分类号
主分类号
代理机构
代理人
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