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发明名称
Vorrichtung zur elektromagnetischen Aufzeichnung von Schallschwingungen
摘要
申请公布号
DE588721(C)
申请公布日期
1933.12.13
申请号
DE1932L081036D
申请日期
1932.04.26
申请人
LABORATORIUM GEORG NEUMANN
发明人
分类号
H04R1/16
主分类号
H04R1/16
代理机构
代理人
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