Rechenvorrichtung zur Darstellung der Bruchrechnung,申请号DE1931W086350D-传众专利搜索

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发明名称	Rechenvorrichtung zur Darstellung der Bruchrechnung
摘要
申请公布号	DE576580(C)	申请公布日期	1933.05.11
申请号	DE1931W086350D	申请日期	1931.06.30
申请人	DR. HERMANN WALSEMANN	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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