Teaching attachment for typewriters,申请号US19630277513-传众专利搜索

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发明名称	Teaching attachment for typewriters
摘要
申请公布号	US3229800(A)	申请公布日期	1966.01.18
申请号	US19630277513	申请日期	1963.05.02
申请人	NIELS KRAG	发明人	KRAG NIELS
分类号	B41J29/393;G09B13/04	主分类号	B41J29/393
代理机构		代理人
主权项
地址

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