Improvements in or relating to electrical signalling apparatus,申请号GB19530021889-传众专利搜索

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发明名称	Improvements in or relating to electrical signalling apparatus
摘要
申请公布号	GB759269(A)	申请公布日期	1956.10.17
申请号	GB19530021889	申请日期	1953.08.07
申请人	BRITISH TELECOMMUNICATIONS RESEARCH LIMITED	发明人	FELIX MICHAEL OTTO;SPENCER HERBERT CYRIL
分类号	H04W84/02	主分类号	H04W84/02
代理机构		代理人
主权项
地址

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