Flyleaf construction for ring binders,申请号US19390249216-传众专利搜索

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发明名称	Flyleaf construction for ring binders
摘要
申请公布号	US2179757(A)	申请公布日期	1939.11.14
申请号	US19390249216	申请日期	1939.01.04
申请人	NATIONAL BLANK BOOK COMPANY	发明人	SCHADE JOHN
分类号	B42F13/40	主分类号	B42F13/40
代理机构		代理人
主权项
地址

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