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经营范围
发明名称
Improvements in telephone systems
摘要
申请公布号
GB763564(A)
申请公布日期
1956.12.12
申请号
GB19540034799
申请日期
1954.12.01
申请人
WESTERN ELECTRIC COMPANY
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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