Improvements in and relating to light controlling devices,申请号GB19470002339-传众专利搜索

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发明名称	Improvements in and relating to light controlling devices
摘要
申请公布号	GB620639(A)	申请公布日期	1949.03.28
申请号	GB19470002339	申请日期	1947.01.24
申请人	SOCIETE ANONYME HOLOPHANE	发明人
分类号	F21V5/00	主分类号	F21V5/00
代理机构		代理人
主权项
地址

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