Improvements in submarine signalling,申请号GB19290028992-传众专利搜索

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发明名称	Improvements in submarine signalling
摘要
申请公布号	GB340042(A)	申请公布日期	1930.12.24
申请号	GB19290028992	申请日期	1929.09.24
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人
分类号	H04B3/00	主分类号	H04B3/00
代理机构		代理人
主权项
地址

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