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发明名称
Improvements in sound reproducing apparatus
摘要
申请公布号
GB530068(A)
申请公布日期
1940.12.04
申请号
GB19390017504
申请日期
1939.06.15
申请人
OTTO KURT KOLB;REGINALD ALBERT TOMES
发明人
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主分类号
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