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经营范围
发明名称
Improvements in or relating to sound reproducing devices
摘要
申请公布号
GB596104(A)
申请公布日期
1947.12.29
申请号
GB19450018482
申请日期
1945.07.19
申请人
MARCONI'S WIRELESS TELEGRAPH COMPANY LIMITED
发明人
分类号
H04R7/20
主分类号
H04R7/20
代理机构
代理人
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