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经营范围
发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB542345(A)
申请公布日期
1942.01.05
申请号
GB19410003788
申请日期
1941.03.20
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED;THOMAS PHILIP PREIST;GEORGE WILLIAM THOMPSON
发明人
分类号
H04Q5/16
主分类号
H04Q5/16
代理机构
代理人
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地址
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