Combination of learning materials and self-scoring tests,申请号US19650440698-传众专利搜索

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发明名称	Combination of learning materials and self-scoring tests
摘要
申请公布号	US3242596(A)	申请公布日期	1966.03.29
申请号	US19650440698	申请日期	1965.03.18
申请人	SAMUEL SMITH	发明人	SMITH SAMUEL
分类号	G09B3/04;G09B3/08	主分类号	G09B3/04
代理机构		代理人
主权项
地址

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