Safety shutter for picture projectors,申请号US19460690699-传众专利搜索

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发明名称	Safety shutter for picture projectors
摘要
申请公布号	US2504966(A)	申请公布日期	1950.04.25
申请号	US19460690699	申请日期	1946.08.15
申请人	AMPRO CORPORATION	发明人	DEARBORN ARTHUR S.
分类号	G03B21/18	主分类号	G03B21/18
代理机构		代理人
主权项
地址

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