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发明名称
Apparat til optagelse eller gengivelse af akustiske vibrationer og forsynet med en variabel akustisk impedans.
摘要
申请公布号
DK93851(C)
申请公布日期
1962.07.09
申请号
DK19590004571
申请日期
1959.12.16
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H04M;(IPC1-7):H04M
主分类号
H04M
代理机构
代理人
主权项
地址
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