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发明名称
ELECTRICAL SIGNALLING SYSTEMS
摘要
申请公布号
CA515177(A)
申请公布日期
1955.08.02
申请号
CAD515177
申请日期
申请人
AUTOMATIC TELEPHONE AND ELECTRIC COMPANY LIMITED
发明人
ALAN DAVISON;RONALD THREADGOLD
分类号
主分类号
代理机构
代理人
主权项
地址
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