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发明名称
SELECTION PULSE AND RINGING CURRENT TRANSMITTER
摘要
申请公布号
PL124151(B1)
申请公布日期
1982.12.31
申请号
PL19790212796
申请日期
1979.01.12
申请人
发明人
分类号
H04M;H04M3/02;(IPC1-7):H04M3/02
主分类号
H04M
代理机构
代理人
主权项
地址
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