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发明名称
BIDIRECTIONAL SELECTION SYSTEM FOR RELAY LINE
摘要
申请公布号
JPH0449758(A)
申请公布日期
1992.02.19
申请号
JP19900159101
申请日期
1990.06.18
申请人
NEC CORP
发明人
NAKANO MASAAKI
分类号
H04Q3/545;H04M7/06;H04Q3/66
主分类号
H04Q3/545
代理机构
代理人
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地址
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