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发明名称
Improvements in electric selective signalling systems
摘要
申请公布号
GB581452(A)
申请公布日期
1946.10.14
申请号
GB19440010848
申请日期
1944.06.06
申请人
LESLIE RICHARD FROST
发明人
分类号
G08C19/20
主分类号
G08C19/20
代理机构
代理人
主权项
地址
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