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发明名称
TRUNK LINE CONNECTION MONITOR FOR PRIVATE EXCHANGE
摘要
申请公布号
JPH02137454(A)
申请公布日期
1990.05.25
申请号
JP19880291271
申请日期
1988.11.18
申请人
NEC CORP
发明人
IWAMA KAZUO
分类号
H04M3/28
主分类号
H04M3/28
代理机构
代理人
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地址
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