Thermionic tube and heater element therefor,申请号US19290401608-传众专利搜索

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发明名称	Thermionic tube and heater element therefor
摘要
申请公布号	US1908792(A)	申请公布日期	1933.05.16
申请号	US19290401608	申请日期	1929.10.22
申请人	RUBEN TUBE COMPANY	发明人	RUBEN SAMUEL
分类号	H01B3/10;H01J1/22	主分类号	H01B3/10
代理机构		代理人
主权项
地址

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