Two-way telephone transmission system,申请号US19410380428-传众专利搜索

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发明名称	Two-way telephone transmission system
摘要
申请公布号	US2326081(A)	申请公布日期	1943.08.03
申请号	US19410380428	申请日期	1941.02.25
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	WYNEN KENNETH G. VAN
分类号	H04M3/40	主分类号	H04M3/40
代理机构		代理人
主权项
地址

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