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发明名称
TEACHING PLATE FOR A LETTER
摘要
申请公布号
KR900004529(Y1)
申请公布日期
1990.05.21
申请号
KR19870014976U
申请日期
1987.09.02
申请人
OH KI-YOUNG
发明人
OH KI-YOUNG
分类号
G09B19/00;(IPC1-7):G09B19/00
主分类号
G09B19/00
代理机构
代理人
主权项
地址
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