Educational balance device,申请号US19650496483-传众专利搜索

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发明名称	Educational balance device
摘要
申请公布号	US3339291(A)	申请公布日期	1967.09.05
申请号	US19650496483	申请日期	1965.10.15
申请人	HARCOURT, BRACE & WORLD, INC.	发明人	RUCHLIS HYMAN
分类号	G01G19/00;G09B23/10	主分类号	G01G19/00
代理机构		代理人
主权项
地址

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