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发明名称
Metallische Membran mit konzentrischen Wellen in der Randzone der Schwingungsflaeche fuer akustische Alarmvorrichtungen
摘要
申请公布号
DE498948(C)
申请公布日期
1930.05.30
申请号
DE1926G068453D
申请日期
1926.10.12
申请人
DIPL.-ING. MAX GREINER
发明人
分类号
G10K13/00
主分类号
G10K13/00
代理机构
代理人
主权项
地址
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