Low frequency indicator and recorder,申请号US19380243623-传众专利搜索

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发明名称	Low frequency indicator and recorder
摘要
申请公布号	US2273532(A)	申请公布日期	1942.02.17
申请号	US19380243623	申请日期	1938.12.02
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	LOVELL CLARENCE A.
分类号	A61B5/024	主分类号	A61B5/024
代理机构		代理人
主权项
地址

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