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发明名称
TELEPHONE EXCHANGE SYSTEM
摘要
申请公布号
JPS647753(A)
申请公布日期
1989.01.11
申请号
JP19870132145
申请日期
1987.05.27
申请人
NEC CORP
发明人
HAYASHI MITSURU
分类号
H04M3/42
主分类号
H04M3/42
代理机构
代理人
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