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发明名称
TELEPHONE CIRCUIT OF DIGITAL KEYPHONE WITH EXTENSION LINE SIDE SOUND FUNCTION
摘要
申请公布号
KR1019970005262(B1)
申请公布日期
1997.04.14
申请号
KR1019940010342
申请日期
1994.05.12
申请人
发明人
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主分类号
代理机构
代理人
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