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发明名称
Stimmbildungsgeraet
摘要
申请公布号
DE525139(C)
申请公布日期
1931.05.19
申请号
DED525139D
申请日期
1930.07.23
申请人
RAOUL STROMFELD
发明人
分类号
G09B15/00;G10G7/00
主分类号
G09B15/00
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