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发明名称
PERIODICAL MAINTENANCE SYSTEM FOR EXCHANGE
摘要
申请公布号
JPH03117050(A)
申请公布日期
1991.05.17
申请号
JP19890253466
申请日期
1989.09.28
申请人
HITACHI LTD;NIPPON TELEGR & TELEPH CORP <NTT>
发明人
KIMURA TOKUHITO;ITAGAKI TAKESHI;OHASHI TAKUJI;KIMURA MASANORI;KURABE AKIO;OHASHI DAIKI
分类号
H04L12/26
主分类号
H04L12/26
代理机构
代理人
主权项
地址
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