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发明名称
TEACHING MATERIAL WITH AND INDEX
摘要
申请公布号
KR890001699(Y1)
申请公布日期
1989.04.07
申请号
KR19860003068U
申请日期
1986.03.14
申请人
HONG UI-SOK
发明人
HONG UI-SOK
分类号
G09B1/24;(IPC1-7):G09B1/24
主分类号
G09B1/24
代理机构
代理人
主权项
地址
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