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发明名称
Improvements in microphones
摘要
申请公布号
GB544596(A)
申请公布日期
1942.04.20
申请号
GB19400017160
申请日期
1940.12.02
申请人
MARCONI'S WIRELESS TELEGRAPH COMPANY LIMITED
发明人
分类号
H04R1/40
主分类号
H04R1/40
代理机构
代理人
主权项
地址
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