Visual aids and educational devices,申请号GB19620010693-传众专利搜索

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发明名称	Visual aids and educational devices
摘要
申请公布号	GB1031718(A)	申请公布日期	1966.06.02
申请号	GB19620010693	申请日期	1962.03.20
申请人	JOSEPH PETER JOHNSON;GEORGE ROBERT LEVITT	发明人
分类号	G09B27/02	主分类号	G09B27/02
代理机构		代理人
主权项
地址

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