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发明名称
DIGITALES TASTWAHLSYSTEM FUER MIT DELTAMODULATION ARBEITENDE FERNSPRECH-TEILNEHMERSTELLEN
摘要
申请公布号
DE2109909(B2)
申请公布日期
1972.08.24
申请号
DE19712109909
申请日期
1971.03.02
申请人
发明人
分类号
H04M1/26;H04M1/515;H04Q11/04;(IPC1-7):H04Q1/38
主分类号
H04M1/26
代理机构
代理人
主权项
地址
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