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发明名称
Electrical signalling systems
摘要
申请公布号
US2854655(A)
申请公布日期
1958.09.30
申请号
US19530357528
申请日期
1953.05.26
申请人
BRITISH TELECOMMUNICATIONS RESEARCH LIMITED
发明人
BEAUFOY RAYMOND;BAKER GEORGE THOMAS
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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