Visual aid for arithmetic computation,申请号US19550554258-传众专利搜索

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发明名称	Visual aid for arithmetic computation
摘要
申请公布号	US2835988(A)	申请公布日期	1958.05.27
申请号	US19550554258	申请日期	1955.12.20
申请人	HENRY HILKENE	发明人	HILKENE HENRY
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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