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发明名称
Improvements in and relating to telephone and other electric wave transmission systems
摘要
申请公布号
GB525557(A)
申请公布日期
1940.08.30
申请号
GB19390002466
申请日期
1939.01.24
申请人
REGINALD JOHN HALSEY
发明人
分类号
H03G7/02
主分类号
H03G7/02
代理机构
代理人
主权项
地址
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