Filter holding box,申请号US19380185490-传众专利搜索

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发明名称	Filter holding box
摘要
申请公布号	US2218884(A)	申请公布日期	1940.10.22
申请号	US19380185490	申请日期	1938.01.18
申请人	OSKAR KELLNER	发明人	KELLNER OSKAR
分类号	G03B17/12	主分类号	G03B17/12
代理机构		代理人
主权项
地址

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