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发明名称
Improvements in key switching devices suitable for use in telephone systems
摘要
申请公布号
GB515180(A)
申请公布日期
1939.11.28
申请号
GB19380015790
申请日期
1938.05.26
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
分类号
H01H21/02
主分类号
H01H21/02
代理机构
代理人
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