Apparatus for compressing or expanding the frequency bands of electric oscillations,申请号US19480031294-传众专利搜索

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发明名称	Apparatus for compressing or expanding the frequency bands of electric oscillations
摘要
申请公布号	US2545871(A)	申请公布日期	1951.03.20
申请号	US19480031294	申请日期	1948.06.05
申请人	BRITISH TELECOMMUNICATIONS RESEARCH LIMITED	发明人	BELL DAVID ARTHUR
分类号	H03H7/34	主分类号	H03H7/34
代理机构		代理人
主权项
地址

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