Lehrmittel fuer den Rechenunterricht,申请号DE1929P061822D-传众专利搜索

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发明名称	Lehrmittel fuer den Rechenunterricht
摘要
申请公布号	DE539742(C)	申请公布日期	1931.12.02
申请号	DE1929P061822D	申请日期	1929.12.06
申请人	RICHARD PFLAUMBAUM	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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