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发明名称
Improvements in vacuum tube circuits for electrical signalling systems
摘要
申请公布号
GB398240(A)
申请公布日期
1933.09.11
申请号
GB19320007286
申请日期
1932.03.11
申请人
STANDARD TELEPHONES AND CABLES, LIMITED
发明人
分类号
H04L27/04
主分类号
H04L27/04
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代理人
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