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发明名称
RAILWAY TRACK CIRCUIT
摘要
申请公布号
CA321885(A)
申请公布日期
1932.04.26
申请号
CAD321885
申请日期
申请人
THE GENERAL RAILWAY SIGNAL COMPANY
发明人
AINSLIE T. CARTER
分类号
主分类号
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代理人
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