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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB523569(A)
申请公布日期
1940.07.17
申请号
GB19390000441
申请日期
1939.01.05
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED
发明人
分类号
H04Q1/442
主分类号
H04Q1/442
代理机构
代理人
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地址
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