Duplex telegraph system for loaded cables,申请号US19270244025-传众专利搜索

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发明名称	Duplex telegraph system for loaded cables
摘要
申请公布号	US1753336(A)	申请公布日期	1930.04.08
申请号	US19270244025	申请日期	1927.12.31
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	GILBERT JOHN J.
分类号	H04L5/14	主分类号	H04L5/14
代理机构		代理人
主权项
地址

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