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经营范围
发明名称
Improvements in means for suppressing echo in telephone circuits and the like
摘要
申请公布号
GB413411(A)
申请公布日期
1934.07.19
申请号
GB19330004554
申请日期
1933.02.14
申请人
THE GENERAL ELECTRIC COMPANY LIMITED;LESLIE IVAN FARREN
发明人
分类号
H03F1/54;H04B3/20
主分类号
H03F1/54
代理机构
代理人
主权项
地址
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