ELECTRICAL TEACHING SYSTEM,申请号USD3477143-传众专利搜索

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发明名称	ELECTRICAL TEACHING SYSTEM
摘要
申请公布号	US3477143(A)	申请公布日期	1969.11.11
申请号	USD3477143	申请日期	1967.12.06
申请人	ROBERT E. AUMANN	发明人	ROBERT E. AUMANN
分类号	G09B7/06;(IPC1-7):G09B7/06	主分类号	G09B7/06
代理机构		代理人
主权项
地址

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