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经营范围
发明名称
SIGNAL SWITCHING SYSTEM
摘要
申请公布号
JPH0273732(A)
申请公布日期
1990.03.13
申请号
JP19880225636
申请日期
1988.09.09
申请人
NEC CORP
发明人
NAKAI TAKAO
分类号
H04J3/00;H04J3/06
主分类号
H04J3/00
代理机构
代理人
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地址
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