Improvements in and relating to apparatus for compressing or expanding the frequencybands of electric oscillations,申请号GB19470014934-传众专利搜索

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发明名称	Improvements in and relating to apparatus for compressing or expanding the frequencybands of electric oscillations
摘要
申请公布号	GB640015(A)	申请公布日期	1950.07.12
申请号	GB19470014934	申请日期	1947.06.05
申请人	BRITISH TELECOMMUNICATIONS RESEARCH LIMITED;DAVID ARTHUR BELL	发明人
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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