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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB809870(A)
申请公布日期
1959.03.04
申请号
GB19560027402
申请日期
1956.09.07
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED
发明人
GALVIN JOHN LESLIE
分类号
H04M3/523;H04Q3/00
主分类号
H04M3/523
代理机构
代理人
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