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发明名称
Improvements relating to automatic telephone systems
摘要
申请公布号
GB343611(A)
申请公布日期
1931.02.26
申请号
GB19290036330
申请日期
1929.11.27
申请人
SIEMENS BROTHERS & CO., LIMITED;CHARLES LEONARD PETERS
发明人
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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