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发明名称
UEBERWACHUNGSSCHALTUNG IN VERMITTLUNGSSTELLEN FUER DURCHGANGSVERBINDUNGEN
摘要
申请公布号
DE2255753(B2)
申请公布日期
1978.02.23
申请号
DE19722255753
申请日期
1972.11.14
申请人
发明人
分类号
H04Q3/00;(IPC1-7):H04M7/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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