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发明名称
LAUTSPRECHER MIT EINER SCHWINGSPULE UND EINEM PIEZOELEKTRISCHEN RUECKKOPPLUNGSWANDLER
摘要
申请公布号
DE2426474(B2)
申请公布日期
1977.06.02
申请号
DE19742426474
申请日期
1974.05.31
申请人
发明人
分类号
H04R3/04;H04R3/00;(IPC1-7):H04R23/02
主分类号
H04R3/04
代理机构
代理人
主权项
地址
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