Gain adjusting apparatus,申请号US19380219276-传众专利搜索

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发明名称	Gain adjusting apparatus
摘要
申请公布号	US2144710(A)	申请公布日期	1939.01.24
申请号	US19380219276	申请日期	1938.07.14
申请人	AMERICAN TELEPHONE AND TELEGRAPH COMPANY	发明人	ROMNES HAAKON INGOLF
分类号	H04B3/10	主分类号	H04B3/10
代理机构		代理人
主权项
地址

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