Die cast loose-leaf ring metal frame,申请号US19500176699-传众专利搜索

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发明名称	Die cast loose-leaf ring metal frame
摘要
申请公布号	US2664897(A)	申请公布日期	1954.01.05
申请号	US19500176699	申请日期	1950.07.29
申请人	LOOSE LEAF METALS COMPANY	发明人	DERRINGER PETE O.
分类号	B42F13/26	主分类号	B42F13/26
代理机构		代理人
主权项
地址

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