Two-way speech transmission,申请号US19410388781-传众专利搜索

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发明名称	Two-way speech transmission
摘要
申请公布号	US2273945(A)	申请公布日期	1942.02.24
申请号	US19410388781	申请日期	1941.04.16
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	FISHER HAROLD J.
分类号	H04B3/20	主分类号	H04B3/20
代理机构		代理人
主权项
地址

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