Improvements in and relating to thermionic valves,申请号GB19330002987-传众专利搜索

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发明名称	Improvements in and relating to thermionic valves
摘要
申请公布号	GB414357(A)	申请公布日期	1934.07.31
申请号	GB19330002987	申请日期	1933.01.31
申请人	STEPHEN PHILIP DE LASZLO	发明人
分类号	H01J19/42	主分类号	H01J19/42
代理机构		代理人
主权项
地址

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