Prevention of interference in telephone circuits,申请号US19380217983-传众专利搜索

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发明名称	Prevention of interference in telephone circuits
摘要
申请公布号	US2283891(A)	申请公布日期	1942.05.19
申请号	US19380217983	申请日期	1938.07.07
申请人	J. E. PIERSOL;J. ENOCH PIERSOL, JR.	发明人	LAYNE FORREST D.
分类号	H04M1/74	主分类号	H04M1/74
代理机构		代理人
主权项
地址

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