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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB476813(A)
申请公布日期
1937.12.15
申请号
GB19360016669
申请日期
1936.06.15
申请人
AUTOMATIC ELECTRIC COMPANY LIMITED;OWEN AVIS PEARCE
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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