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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB476587(A)
申请公布日期
1937.12.13
申请号
GB19360016345
申请日期
1936.06.11
申请人
ASSOCIATED ELECTRIC LABORATORIES INC.
发明人
分类号
H04M3/28
主分类号
H04M3/28
代理机构
代理人
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