Improvements in or relating to circuit arrangements for keyboard-controlled signalling of digital information in telecommunication systems,申请号GB19550009984-传众专利搜索

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发明名称	Improvements in or relating to circuit arrangements for keyboard-controlled signalling of digital information in telecommunication systems
摘要
申请公布号	GB783637(A)	申请公布日期	1957.09.25
申请号	GB19550009984	申请日期	1955.04.05
申请人	SIEMENS & HALSKE AKTIENGESELLSCHAFT	发明人
分类号	H04M1/515;H04Q3/00	主分类号	H04M1/515
代理机构		代理人
主权项
地址

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