TEACHING AID,申请号USD3570140-传众专利搜索

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发明名称	TEACHING AID
摘要
申请公布号	US3570140(A)	申请公布日期	1971.03.16
申请号	USD3570140	申请日期	1969.07.02
申请人	EDMUND J. SPRONG	发明人	EDMUND J. SPRONG
分类号	G09B9/06;(IPC1-7):G09B9/06	主分类号	G09B9/06
代理机构		代理人
主权项
地址

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