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经营范围
发明名称
Apparatus comprising a microphone and an amplifier
摘要
申请公布号
GB1084018(A)
申请公布日期
1967.09.20
申请号
GB19640036441
申请日期
1964.09.04
申请人
NORTHERN ELECTRIC COMPANY LIMITED
发明人
分类号
H03F3/183;H03F3/185;H04R19/01;H04R19/04
主分类号
H03F3/183
代理机构
代理人
主权项
地址
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