Educational head structure with shiftable vocal members,申请号US19490075388-传众专利搜索

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法人/股东/高管

发明名称	Educational head structure with shiftable vocal members
摘要
申请公布号	US2574838(A)	申请公布日期	1951.11.13
申请号	US19490075388	申请日期	1949.02.09
申请人	FARR OLSON FRANCES	发明人	OLSON FRANCES FARR
分类号	G09B23/32	主分类号	G09B23/32
代理机构		代理人
主权项
地址

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