Educational appliance for teaching arithmetic,申请号GB19380020389-传众专利搜索

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发明名称	Educational appliance for teaching arithmetic
摘要
申请公布号	GB499015(A)	申请公布日期	1939.01.17
申请号	GB19380020389	申请日期	1938.07.09
申请人	RUDOLF SCHLEGEL	发明人
分类号	G09B19/02	主分类号	G09B19/02
代理机构		代理人
主权项
地址

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