Aid to art practice and instruction,申请号US19450608147-传众专利搜索

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发明名称	Aid to art practice and instruction
摘要
申请公布号	US2454899(A)	申请公布日期	1948.11.30
申请号	US19450608147	申请日期	1945.08.01
申请人	TWOMEY KATHRYN B	发明人	TWOMEY KATHRYN B.
分类号	G09B11/00	主分类号	G09B11/00
代理机构		代理人
主权项
地址

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