Voice operated circuit,申请号US19310578350-传众专利搜索

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发明名称	Voice operated circuit
摘要
申请公布号	US1939680(A)	申请公布日期	1933.12.19
申请号	US19310578350	申请日期	1931.12.01
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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