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发明名称
DTMF receiver
摘要
申请公布号
EP0347038(B1)
申请公布日期
1996.01.24
申请号
EP19890304746
申请日期
1989.05.10
申请人
TEXAS INSTRUMENTS INCORPORATED
发明人
SO, JOHN LING WING
分类号
H04Q1/457;G01R23/14;H03H17/02;H03H21/00;(IPC1-7):H04Q1/457
主分类号
H04Q1/457
代理机构
代理人
主权项
地址
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