Improvement in thermionic switching system,申请号GB19310012867-传众专利搜索

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发明名称	Improvement in thermionic switching system
摘要
申请公布号	GB378023(A)	申请公布日期	1932.08.02
申请号	GB19310012867	申请日期	1931.05.01
申请人	COMMUNICATION PATENTS, INC.	发明人
分类号	H04J3/04	主分类号	H04J3/04
代理机构		代理人
主权项
地址

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