Volume control system,申请号US19340746078-传众专利搜索

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发明名称	Volume control system
摘要
申请公布号	US2080581(A)	申请公布日期	1937.05.18
申请号	US19340746078	申请日期	1934.09.29
申请人	RADIO CORPORATION OF AMERICA	发明人	SMITH ROGERS M.
分类号	H03G3/24	主分类号	H03G3/24
代理机构		代理人
主权项
地址

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