Учебное наглядное пособие по счету,申请号SU19470371522-传众专利搜索

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发明名称	Учебное наглядное пособие по счету
摘要
申请公布号	SU81393(A1)	申请公布日期	1948.11.30
申请号	SU19470371522	申请日期	1947.11.28
申请人	YABLONSKIJ E.E.	发明人	YABLONSKIJ E.E.
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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