Sound translating device,申请号US19310513466-传众专利搜索

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发明名称	Sound translating device
摘要
申请公布号	US1917012(A)	申请公布日期	1933.07.04
申请号	US19310513466	申请日期	1931.02.05
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	BLATTNER DAVID G.
分类号	H04R1/22	主分类号	H04R1/22
代理机构		代理人
主权项
地址

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