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发明名称
RAILWAY SIGNALLING SYSTEM
摘要
申请公布号
CA306932(A)
申请公布日期
1930.12.23
申请号
CAD306932
申请日期
申请人
THE AUTOMATIC TELEPHONE MANUFACTURING COMPANY;THE AUTOMATIC ELECTRIC INC.
发明人
ALFRED ERNEST HUDD
分类号
主分类号
代理机构
代理人
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