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发明名称
Improvements in and relating to sound reproducing apparatus
摘要
申请公布号
GB389456(A)
申请公布日期
1933.03.16
申请号
GB19310017103
申请日期
1931.06.12
申请人
HANS FRIESS
发明人
分类号
G03B31/00
主分类号
G03B31/00
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代理人
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