Frequency responsive apparatus,申请号US19330663348-传众专利搜索

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发明名称	Frequency responsive apparatus
摘要
申请公布号	US1959161(A)	申请公布日期	1934.05.15
申请号	US19330663348	申请日期	1933.03.29
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	GRONDAHL LARS O.
分类号	H02P9/42	主分类号	H02P9/42
代理机构		代理人
主权项
地址

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