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发明名称
ELECTRIC SELECTIVE SIGNALLING SYSTEMS
摘要
申请公布号
CA525139(A)
申请公布日期
1956.05.15
申请号
CAD525139
申请日期
申请人
SIEMENS BROTHERS AND CO. LIMITED
发明人
ALBERT M. HAILEY
分类号
主分类号
代理机构
代理人
主权项
地址
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