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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB371525(A)
申请公布日期
1932.04.28
申请号
GB19310005681
申请日期
1931.02.23
申请人
SIEMENS AND HALSKE AKTIENGESELLSCHAFT
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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