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发明名称
SIGNALLING IN PBX SYSTEMS
摘要
申请公布号
GB2085695(B)
申请公布日期
1984.09.12
申请号
GB19810028946
申请日期
1981.09.24
申请人
SIEMENS AG
发明人
分类号
H04L25/49;H04M9/00;(IPC1-7):H04L7/02
主分类号
H04L25/49
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