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经营范围
发明名称
Improvements in or relating to microphone apparatus
摘要
申请公布号
GB515377(A)
申请公布日期
1939.12.04
申请号
GB19380016153
申请日期
1938.05.30
申请人
MARCONI'S WIRELESS TELEGRAPH COMPANY LIMITED
发明人
分类号
H04R3/00
主分类号
H04R3/00
代理机构
代理人
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