Educational device,申请号US19290408448-传众专利搜索

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发明名称	Educational device
摘要
申请公布号	US1820209(A)	申请公布日期	1931.08.25
申请号	US19290408448	申请日期	1929.11.20
申请人	KETTERLINUS LITHOGRAPHIC MFG. CO.	发明人	BACON HARRY S.C.
分类号	G09B13/00	主分类号	G09B13/00
代理机构		代理人
主权项
地址

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