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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB334534(A)
申请公布日期
1930.09.04
申请号
GB19290017086
申请日期
1929.06.04
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
分类号
H04Q3/62
主分类号
H04Q3/62
代理机构
代理人
主权项
地址
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