Undervisningsapparat med opgaveblad.,申请号DK19680006011-传众专利搜索

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发明名称	Undervisningsapparat med opgaveblad.
摘要
申请公布号	DK123614(B)	申请公布日期	1972.07.10
申请号	DK19680006011	申请日期	1968.12.09
申请人	EDUARD RITTER	发明人	EDUARD RITTER
分类号	G09B3/04;(IPC1-7):G09B3/04	主分类号	G09B3/04
代理机构		代理人
主权项
地址

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