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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB814598(A)
申请公布日期
1959.06.10
申请号
GB19580029422
申请日期
1956.04.28
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED
发明人
DAVISON ALAN;ALLEN LESLIE JOHN
分类号
H04Q3/52
主分类号
H04Q3/52
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代理人
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