RATIO AND PROPORTION DEMONSTRATING DEVICE,申请号USD3531877-传众专利搜索

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发明名称	RATIO AND PROPORTION DEMONSTRATING DEVICE
摘要
申请公布号	US3531877(A)	申请公布日期	1970.10.06
申请号	USD3531877	申请日期	1968.04.19
申请人	JOHN EVERETT MILLER	发明人	JOHN EVERETT MILLER
分类号	G09B23/04;(IPC1-7):G09B23/02	主分类号	G09B23/04
代理机构		代理人
主权项
地址

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