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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB615505(A)
申请公布日期
1949.01.06
申请号
GB19480000452
申请日期
1945.12.15
申请人
FRANK TENCH
发明人
分类号
H04Q5/00
主分类号
H04Q5/00
代理机构
代理人
主权项
地址
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