Four-wire system with echo suppressors,申请号US19330689014-传众专利搜索

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发明名称	Four-wire system with echo suppressors
摘要
申请公布号	US2041562(A)	申请公布日期	1936.05.19
申请号	US19330689014	申请日期	1933.09.11
申请人	SIEMENS & HALSKE, AKTIENGESELLSCHAFT	发明人	MAYER HANS
分类号	H04B3/20	主分类号	H04B3/20
代理机构		代理人
主权项
地址

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