Improvements in or relating to thermionic valve signalling systems,申请号GB19450018089-传众专利搜索

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发明名称	Improvements in or relating to thermionic valve signalling systems
摘要
申请公布号	GB596027(A)	申请公布日期	1947.12.24
申请号	GB19450018089	申请日期	1945.07.16
申请人	BERTRAM MORTON HADFIELD	发明人
分类号	H04Q1/30	主分类号	H04Q1/30
代理机构		代理人
主权项
地址

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