Optical comparison exposure meter used in photographic enlarging or reproducing work,申请号US19470766624-传众专利搜索

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发明名称	Optical comparison exposure meter used in photographic enlarging or reproducing work
摘要
申请公布号	US2493673(A)	申请公布日期	1950.01.03
申请号	US19470766624	申请日期	1947.08.06
申请人	LASZLO KALMAN	发明人	KALMAN LASZLO
分类号	G01J1/12;G01J1/22	主分类号	G01J1/12
代理机构		代理人
主权项
地址

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