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发明名称
Schallaufnahme- und Schallwiedergabevorrichtung
摘要
申请公布号
DE498241(C)
申请公布日期
1930.05.22
申请号
DE1928L071169D
申请日期
1928.03.01
申请人
DR. SIEGMUND LOEWE
发明人
分类号
G11B15/56
主分类号
G11B15/56
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代理人
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