Tone control device,申请号US19370156628-传众专利搜索

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发明名称	Tone control device
摘要
申请公布号	US2254122(A)	申请公布日期	1941.08.26
申请号	US19370156628	申请日期	1937.07.31
申请人	TELEFUNKEN GESELLSCHAFT FUR DRAHTLOSE TELEGRAPHIE M.B.H.	发明人	SCHONE ALFRED;STEFFENS EUGEN
分类号	H03G5/02	主分类号	H03G5/02
代理机构		代理人
主权项
地址

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