TEACHING AID AND INSTANT SELF-CORRECTING RESPONSE DEVICE,申请号CAD789223-传众专利搜索

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发明名称	TEACHING AID AND INSTANT SELF-CORRECTING RESPONSE DEVICE
摘要
申请公布号	CA789223(A)	申请公布日期	1968.07.09
申请号	CAD789223	申请日期
申请人	ALVAN F. DAVENPORT	发明人	ALVAN F. DAVENPORT
分类号		主分类号
代理机构		代理人
主权项
地址

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