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发明名称
Private telephone system
摘要
申请公布号
GB2179523(A)
申请公布日期
1987.03.04
申请号
GB19850021182
申请日期
1985.08.23
申请人
* FERRANTI GTE LIMITED
发明人
NIGEL JOHN * HEATH;DAVID ERIC * PLEWS
分类号
H04M1/723;H04M9/02;(IPC1-7):H04M9/02
主分类号
H04M1/723
代理机构
代理人
主权项
地址
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