Masking means for program teaching binders,申请号US19610123949-传众专利搜索

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发明名称	Masking means for program teaching binders
摘要
申请公布号	US3131485(A)	申请公布日期	1964.05.05
申请号	US19610123949	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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