Duplex high-frequency telephone system,申请号US19250077290-传众专利搜索

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发明名称	Duplex high-frequency telephone system
摘要
申请公布号	US1757114(A)	申请公布日期	1930.05.06
申请号	US19250077290	申请日期	1925.12.23
申请人	FEDERAL TELEGRAPH COMPANY	发明人	JR. ROBERT D. DUNCAN,
分类号	H04B1/50	主分类号	H04B1/50
代理机构		代理人
主权项
地址

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