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发明名称
Improvements in or relating to signalling systems
摘要
申请公布号
GB630098(A)
申请公布日期
1949.10.05
申请号
GB19470015024
申请日期
1947.06.06
申请人
WESTERN ELECTRIC COMPANY INCORPORATED
发明人
分类号
H04B14/04
主分类号
H04B14/04
代理机构
代理人
主权项
地址
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