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发明名称
Improvements in or relating to sound reproducing apparatus
摘要
申请公布号
GB489956(A)
申请公布日期
1938.08.08
申请号
GB19370003565
申请日期
1937.02.06
申请人
EUGEN BAUER G.M.B.H.
发明人
分类号
G03B31/00
主分类号
G03B31/00
代理机构
代理人
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