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经营范围
发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB540132(A)
申请公布日期
1941.10.07
申请号
GB19400006073
申请日期
1940.04.04
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED;FRANK EDGAR COMYN;EMANUEL FRYDMAN
发明人
分类号
H04Q3/62
主分类号
H04Q3/62
代理机构
代理人
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地址
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