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发明名称
Elektroakustisches UEbertragungssystem ohne akustische Rueckkopplung, bei dem im Gegensprechbetrieb ueber vierdraehtige Verbindungsleitungen und mit Lautsprechern gearbeitet wird
摘要
申请公布号
DE617724(C)
申请公布日期
1935.08.24
申请号
DE1932W088286D
申请日期
1932.02.20
申请人
DIPL.-ING. RUDOLF WINZHEIMER;HANS REPPISCH
发明人
分类号
H04M9/08
主分类号
H04M9/08
代理机构
代理人
主权项
地址
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