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经营范围
发明名称
DOOR PHONE CIRCUIT OF KEY TELEPHONE SYSTEM
摘要
申请公布号
KR1019900001338(B1)
申请公布日期
1990.03.08
申请号
KR1019860007298
申请日期
1986.08.30
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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