Sound amplifying apparatus for telephone circuits,申请号US19540409033-传众专利搜索

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发明名称	Sound amplifying apparatus for telephone circuits
摘要
申请公布号	US2786099(A)	申请公布日期	1957.03.19
申请号	US19540409033	申请日期	1954.02.09
申请人	BEATTY DONALD C	发明人	BEATTY DONALD C.
分类号	H04M1/60	主分类号	H04M1/60
代理机构		代理人
主权项
地址

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