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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB528971(A)
申请公布日期
1940.11.12
申请号
GB19390013538
申请日期
1939.05.05
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED;REGINALD TAYLOR;GEORGE THOMAS BAKER
发明人
分类号
H04M15/04
主分类号
H04M15/04
代理机构
代理人
主权项
地址
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