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经营范围
发明名称
Interface control circuit between three people in the two line telephone
摘要
申请公布号
KR1019970005271(B1)
申请公布日期
1997.04.14
申请号
KR1019910000382
申请日期
1991.01.12
申请人
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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