Improvements in circuit arrangements for automatic telephone systems,申请号GB19290030549-传众专利搜索

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发明名称	Improvements in circuit arrangements for automatic telephone systems
摘要
申请公布号	GB340634(A)	申请公布日期	1931.01.08
申请号	GB19290030549	申请日期	1929.10.08
申请人	TELEFONAKTIEBOLAGET L.M. ERICSSON	发明人
分类号	H04M1/31	主分类号	H04M1/31
代理机构		代理人
主权项
地址

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