Changing-sign indicator,申请号US19490079056-传众专利搜索

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发明名称	Changing-sign indicator
摘要
申请公布号	US2539654(A)	申请公布日期	1951.01.30
申请号	US19490079056	申请日期	1949.03.01
申请人	RADIO CORPORATION OF AMERICA	发明人	BARNES JOHN P.
分类号	F21V8/00;G09F19/14;G09F23/00	主分类号	F21V8/00
代理机构		代理人
主权项
地址

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