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发明名称
TRUNK LINE STATE DETECTION CIRCUIT
摘要
申请公布号
JPH03265259(A)
申请公布日期
1991.11.26
申请号
JP19900063756
申请日期
1990.03.14
申请人
MEISEI ELECTRIC CO LTD;NIPPON TELEGR & TELEPH CORP <NTT>
发明人
OKUMA HIROYUKI;TANAKA HIDEO;YOKOYAMA NORIKAZU
分类号
H04M3/22
主分类号
H04M3/22
代理机构
代理人
主权项
地址
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