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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB491901(A)
申请公布日期
1938.09.12
申请号
GB19370010546
申请日期
1937.04.13
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED;CHARLES EDMUND BEALE;IDRIS TREVOR RICHARDS
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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