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发明名称
SIGNAL PROCESSING APPARATUS FOR SUBSCRIBER CIRCUITS
摘要
申请公布号
GB2032730(A)
申请公布日期
1980.05.08
申请号
GB19790027987
申请日期
1979.08.10
申请人
HITACHI LTD
发明人
分类号
H04M3/22;H04M19/02;H04Q3/00;(IPC1-7):H04M3/22
主分类号
H04M3/22
代理机构
代理人
主权项
地址
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