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发明名称
Telephone systems
摘要
申请公布号
GB548932(A)
申请公布日期
1942.10.29
申请号
GB19410011701
申请日期
1941.09.12
申请人
STANDARD TELEPHONES AND CABLES LIMITED
发明人
分类号
H01J17/30;H04M15/08;H04Q3/00
主分类号
H01J17/30
代理机构
代理人
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