TEACHING EQUIPMENT OF QUESTIONS AND ANSWERS CONFIRMATION,申请号KR19870011603U-传众专利搜索

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发明名称	TEACHING EQUIPMENT OF QUESTIONS AND ANSWERS CONFIRMATION
摘要
申请公布号	KR900005549(Y1)	申请公布日期	1990.06.20
申请号	KR19870011603U	申请日期	1987.07.15
申请人	LEE GYU-JOO;RYU BAEG-CHON	发明人	RYU BAEG-CHON
分类号	G09B5/06;(IPC1-7):G09B5/06	主分类号	G09B5/06
代理机构		代理人
主权项
地址

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