Improvements in and relating to drop indicators for use in telephone circuits,申请号GB19370009331-传众专利搜索

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发明名称	Improvements in and relating to drop indicators for use in telephone circuits
摘要
申请公布号	GB487904(A)	申请公布日期	1938.06.28
申请号	GB19370009331	申请日期	1937.04.01
申请人	ALBISWERK ZUERICH A.G.	发明人
分类号	G08B5/28	主分类号	G08B5/28
代理机构		代理人
主权项
地址

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