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发明名称
Schaltungsanordnung zur Gespraechsueberwachung auf zweiadrigen Verbindungsleitungen in Fernsprechanlagen mit Wechselstromwahl
摘要
申请公布号
DE616655(C)
申请公布日期
1935.08.02
申请号
DE1932T040423D
申请日期
1932.03.25
申请人
TELEFONAKTIEBOLAGET L.M. ERICSSON
发明人
分类号
H04M7/10;H04Q3/00
主分类号
H04M7/10
代理机构
代理人
主权项
地址
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