Loose-leaf ring binder,申请号US19380189552-传众专利搜索

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发明名称	Loose-leaf ring binder
摘要
申请公布号	US2150590(A)	申请公布日期	1939.03.14
申请号	US19380189552	申请日期	1938.02.09
申请人	NATIONAL BLANK BOOK COMPANY	发明人	SCHADE FRANK STANLEY
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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