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发明名称
SYSTEM SIGNALLING THE STATES OF TELEPHONE LINE
摘要
申请公布号
PL128279(B1)
申请公布日期
1984.01.31
申请号
PL19800224134
申请日期
1980.05.08
申请人
发明人
分类号
H04M;H04M3/22;H04Q1/30;(IPC1-7):H04M3/22
主分类号
H04M
代理机构
代理人
主权项
地址
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