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经营范围
发明名称
Schallwiedergabevorrichtung mit einer Grossflaechenmembran
摘要
申请公布号
DE588742(C)
申请公布日期
1933.11.25
申请号
DE1929D059859D
申请日期
1929.12.05
申请人
JACOBUS CORNELIS DOUW;JOHAN WILLEM VLIELANDER HEIN;CHRISTIAAN HENRI HENNY;MAX ADOLF HENNY, ZUSAMMEN BILDEND DAS "SYNDIKAT J. C. DOUW'S PATENTE"
发明人
分类号
H04R1/34
主分类号
H04R1/34
代理机构
代理人
主权项
地址
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