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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
GB497442(A)
申请公布日期
1938.12.20
申请号
GB19370018163
申请日期
1937.06.30
申请人
MARCONI'S WIRELESS TELEGRAPH COMPANY LIMITED
发明人
分类号
H04R1/38
主分类号
H04R1/38
代理机构
代理人
主权项
地址
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