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发明名称	BLACKBOARD
摘要
申请公布号	KR860000268(Y1)	申请公布日期	1986.03.13
申请号	KR19840001192U	申请日期	1984.02.15
申请人	SO, DO-JANG	发明人	SO, DO-JANG
分类号	B43L1/12	主分类号	B43L1/12
代理机构		代理人
主权项
地址

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