Iron-core static frequency changer,申请号US19270172140-传众专利搜索

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发明名称	Iron-core static frequency changer
摘要
申请公布号	US1787948(A)	申请公布日期	1931.01.06
申请号	US19270172140	申请日期	1927.03.02
申请人	RADIO CORPORATION	发明人	LINDENBLAD NILS E.
分类号	H01F38/04	主分类号	H01F38/04
代理机构		代理人
主权项
地址

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