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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
GB343710(A)
申请公布日期
1931.02.26
申请号
GB19300003195
申请日期
1930.01.30
申请人
MATEI MARINESCU
发明人
分类号
H04R21/02
主分类号
H04R21/02
代理机构
代理人
主权项
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