Device for teaching the telling of time,申请号US19560565996-传众专利搜索

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发明名称	Device for teaching the telling of time
摘要
申请公布号	US2837838(A)	申请公布日期	1958.06.10
申请号	US19560565996	申请日期	1956.02.16
申请人	LEWIS GEORGE P	发明人	LEWIS GEORGE P.
分类号	G09B19/12	主分类号	G09B19/12
代理机构		代理人
主权项
地址

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