Signal monitoring device,申请号US19300460846-传众专利搜索

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发明名称	Signal monitoring device
摘要
申请公布号	US1812625(A)	申请公布日期	1931.06.30
申请号	US19300460846	申请日期	1930.06.13
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	CURTIS AUSTEN M.
分类号	H04L5/22	主分类号	H04L5/22
代理机构		代理人
主权项
地址

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