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发明名称
Improvements in telephone systems
摘要
申请公布号
GB510752(A)
申请公布日期
1939.08.08
申请号
GB19380017591
申请日期
1938.06.14
申请人
THE GENERAL ELECTRIC COMPANY LIMITED;GEORGE HENRY LACEY SHELLEY;OLIVER IRVING CARPENTER
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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