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发明名称
TRAFFIC PROTECTION APPARATUS
摘要
申请公布号
CA479388(A)
申请公布日期
1951.12.11
申请号
CAD479388
申请日期
申请人
THE UNION SWITCH AND SIGNAL COMPANY
发明人
HOWARD A. THOMPSON
分类号
主分类号
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代理人
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