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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB735689(A)
申请公布日期
1955.08.24
申请号
GB19540009012
申请日期
1951.12.14
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED
发明人
DAVISON ALAN;THREADGOLD RONALD
分类号
H04Q3/52
主分类号
H04Q3/52
代理机构
代理人
主权项
地址
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