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发明名称
Vorrichtung zur Verbesserung der Tonwiedergabe von einer Tonaufzeichnung
摘要
申请公布号
DE676173(C)
申请公布日期
1939.05.27
申请号
DED676173D
申请日期
1930.11.12
申请人
JOHN HAYS HAMMOND JR.
发明人
分类号
H03G3/00;H03G3/20;H03G5/20;H03G5/22;H03G9/10;H04B1/62;H04R3/00
主分类号
H03G3/00
代理机构
代理人
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