Constant density multiple color plate,申请号US19550542794-传众专利搜索

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发明名称	Constant density multiple color plate
摘要
申请公布号	US2809552(A)	申请公布日期	1957.10.15
申请号	US19550542794	申请日期	1955.10.25
申请人	WILLIAM CIAVOLA ALEXANDER	发明人	CIAVOLA ALEXANDER WILLIAM
分类号	G03B27/73	主分类号	G03B27/73
代理机构		代理人
主权项
地址

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