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发明名称
Key telephone interface
摘要
申请公布号
EP0463831(B1)
申请公布日期
1998.09.23
申请号
EP19910305667
申请日期
1991.06.21
申请人
AT&T CORP.
发明人
KUTZAVITCH, WALTER G.
分类号
H04Q3/58;H04M3/02;H04M3/42;H04M9/00;(IPC1-7):H04M9/00
主分类号
H04Q3/58
代理机构
代理人
主权项
地址
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