Electrically controlled light filter,申请号US19480042841-传众专利搜索

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发明名称	Electrically controlled light filter
摘要
申请公布号	US2623109(A)	申请公布日期	1952.12.23
申请号	US19480042841	申请日期	1948.08.06
申请人	PRENTICE E. EDRINGTON	发明人	BELL KEITH L.
分类号	H04N9/12	主分类号	H04N9/12
代理机构		代理人
主权项
地址

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