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发明名称
Normalschallquelle fuer die Erzeugung eines bestimmten Frequenzspektrums von gleichbleibender Lautstaerke zum Pruefen und Eichen akustischer Geraete
摘要
申请公布号
DE722642(C)
申请公布日期
1942.07.15
申请号
DE1936S124397D
申请日期
1936.10.02
申请人
SIEMENS & HALSKE AG.
发明人
SCHUPANZ RUDOLF;TROEGER KARL
分类号
G10K15/04;H04R29/00
主分类号
G10K15/04
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代理人
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