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发明名称	DEVICE FOR EDUCATIONAL PURPOSES
摘要
申请公布号	US3499235(A)	申请公布日期	1970.03.10
申请号	USD3499235	申请日期	1966.10.10
申请人	DUDLEY E. CORNELL;JAMES L. EVANS	发明人	DUDLEY E. CORNELL;JAMES L. EVANS
分类号	G09B3/08	主分类号	G09B3/08
代理机构		代理人
主权项
地址

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