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发明名称
Emergency telephone networks
摘要
申请公布号
GB2064917(A)
申请公布日期
1981.06.17
申请号
GB19800038695
申请日期
1980.12.03
申请人
DEUTSCHE TELEPHONWERKE UND KABELINDUSTRIE AG
发明人
分类号
H04M3/30;H04M11/04;(IPC1-7):H04M3/28
主分类号
H04M3/30
代理机构
代理人
主权项
地址
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