Channel repeater for telegraph systems,申请号US19320601858-传众专利搜索

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发明名称	Channel repeater for telegraph systems
摘要
申请公布号	US1967175(A)	申请公布日期	1934.07.17
申请号	US19320601858	申请日期	1932.03.29
申请人	THE WESTERN UNION TELEGRAPH COMPANY	发明人	HAGLUND HAKON H.
分类号	H04L25/42	主分类号	H04L25/42
代理机构		代理人
主权项
地址

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