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发明名称
Vorrichtung zum Aufzeichnen elektrischer Schwingungen, insbesondere fuer Schallplattenaufnahmen
摘要
申请公布号
DE574483(C)
申请公布日期
1933.04.13
申请号
DE1929N029788D
申请日期
1929.01.04
申请人
GEORG NEUMANN
发明人
分类号
H04R11/08
主分类号
H04R11/08
代理机构
代理人
主权项
地址
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