Focusing device for cathode rays,申请号US19290410686-传众专利搜索

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发明名称	Focusing device for cathode rays
摘要
申请公布号	US1937849(A)	申请公布日期	1933.12.05
申请号	US19290410686	申请日期	1929.11.30
申请人	WESTINGHOUSE LAMP COMPANY	发明人	SLACK CHARLES M.
分类号	H01J29/48;H01J29/62;H01J33/00	主分类号	H01J29/48
代理机构		代理人
主权项
地址

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