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发明名称
Telephone power unit line condition indicator - has resistive network and operational amplifier comparator on local power supply
摘要
申请公布号
DE3043681(A1)
申请公布日期
1982.07.08
申请号
DE19803043681
申请日期
1980.11.19
申请人
SIEMENS AG
发明人
DE VOS,FREDDY
分类号
H04M19/00;(IPC1-7):04M3/42
主分类号
H04M19/00
代理机构
代理人
主权项
地址
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