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经营范围
发明名称
Improvements in or relating to microphones
摘要
申请公布号
GB340398(A)
申请公布日期
1931.01.01
申请号
GB19290037696
申请日期
1929.12.09
申请人
COVENTRY AUTOMATIC TELEPHONES, LIMITED;JOHN ALEXANDER TWEATS
发明人
分类号
H04R21/02
主分类号
H04R21/02
代理机构
代理人
主权项
地址
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