Masking device for program teaching use in ring binder assemblies,申请号US19610122544-传众专利搜索

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发明名称	Masking device for program teaching use in ring binder assemblies
摘要
申请公布号	US3111774(A)	申请公布日期	1963.11.26
申请号	US19610122544	申请日期	1961.07.07
申请人	NATIONAL BLANK BOOK COMPANY	发明人	SCHADE FRANK STANLEY
分类号	G09B3/04	主分类号	G09B3/04
代理机构		代理人
主权项
地址

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