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经营范围
发明名称
SUBSCRIBER LINE INTERFACE CIRCUIT
摘要
申请公布号
GB1489143(A)
申请公布日期
1977.10.19
申请号
GB19750045274
申请日期
1975.10.31
申请人
IBM CORP
发明人
分类号
H04Q3/72;H04M19/00;(IPC1-7):H04M19/00
主分类号
H04Q3/72
代理机构
代理人
主权项
地址
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