Teaching aid,申请号US19610091943-传众专利搜索

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发明名称	Teaching aid
摘要
申请公布号	US3056215(A)	申请公布日期	1962.10.02
申请号	US19610091943	申请日期	1961.02.27
申请人	RHEEM MANUFACTURING COMPANY	发明人	SKINNER BURRHUS F.
分类号	G09B3/04	主分类号	G09B3/04
代理机构		代理人
主权项
地址

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