Frequency-changing method and means,申请号US19240710292-传众专利搜索

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发明名称	Frequency-changing method and means
摘要
申请公布号	US1751485(A)	申请公布日期	1930.03.25
申请号	US19240710292	申请日期	1924.05.01
申请人	DE FOREST RADIO TELEPHONE & TELEGRAPH COMPANY	发明人	LOGWOOD CHARLES V.
分类号	H02M5/00	主分类号	H02M5/00
代理机构		代理人
主权项
地址

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