Volume control for radio and interphone circuit,申请号US19400363982-传众专利搜索

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发明名称	Volume control for radio and interphone circuit
摘要
申请公布号	US2257731(A)	申请公布日期	1941.10.07
申请号	US19400363982	申请日期	1940.11.02
申请人	COE JAMES C	发明人	COE JAMES C.
分类号	H03G3/02	主分类号	H03G3/02
代理机构		代理人
主权项
地址

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