Device for eliminating the transmission of extraneous noises in telephone circuits,申请号US19290369948-传众专利搜索

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发明名称	Device for eliminating the transmission of extraneous noises in telephone circuits
摘要
申请公布号	US1779461(A)	申请公布日期	1930.10.28
申请号	US19290369948	申请日期	1929.06.11
申请人	BULKELEY CLAUDE A	发明人	BULKELEY CLAUDE A.
分类号	H04M1/19	主分类号	H04M1/19
代理机构		代理人
主权项
地址

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