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发明名称
CIRCUIT FOR DETECTING COMMUNICATION TERMINATION RELEASE SIGNALS IN RING-DOWN TIE CARD
摘要
申请公布号
KR1019920005582(B1)
申请公布日期
1992.07.09
申请号
KR1019890011640
申请日期
1989.08.16
申请人
发明人
分类号
主分类号
代理机构
代理人
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