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发明名称
LINE CHANGEOVER SYSTEM
摘要
申请公布号
JPH02288514(A)
申请公布日期
1990.11.28
申请号
JP19890107520
申请日期
1989.04.28
申请人
NIPPON TELEGR & TELEPH CORP <NTT>
发明人
OYAMA TORU;KANEKO TAKASHI
分类号
H04B1/74
主分类号
H04B1/74
代理机构
代理人
主权项
地址
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