Two-way telephone system,申请号US19310544194-传众专利搜索

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发明名称	Two-way telephone system
摘要
申请公布号	US1903888(A)	申请公布日期	1933.04.18
申请号	US19310544194	申请日期	1931.06.13
申请人	AMERICAN TELEPHONE AND TELEGRAPH COMPANY	发明人	WRIGHT SUMNER B.;MITCHELL DOREN
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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