Keying circuit,申请号US19390308229-传众专利搜索

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发明名称	Keying circuit
摘要
申请公布号	US2237101(A)	申请公布日期	1941.04.01
申请号	US19390308229	申请日期	1939.12.08
申请人	TELEFUNKEN GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE M. B. H.	发明人	HAHNDORF FRITZ
分类号	H04L27/04	主分类号	H04L27/04
代理机构		代理人
主权项
地址

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