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经营范围
发明名称
Improvements in or relating to circuits for effecting differential amplification of different frequencies
摘要
申请公布号
GB934871(A)
申请公布日期
1963.08.21
申请号
GB19580039080
申请日期
1958.12.04
申请人
ELECTRIC & MUSICAL INDUSTRIES LIMITED
发明人
JAMES IVANHOE JOHN PENFOUND
分类号
H04N5/208
主分类号
H04N5/208
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代理人
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