Improvements in or relating to electric signalling systems and apparatus,申请号GB19310009871-传众专利搜索

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发明名称	Improvements in or relating to electric signalling systems and apparatus
摘要
申请公布号	GB375450(A)	申请公布日期	1932.06.30
申请号	GB19310009871	申请日期	1931.04.01
申请人	ROBERT CONSTANTINE GRASEBY;STEPHEN JOHN MATTHEWS	发明人
分类号	G08B25/08	主分类号	G08B25/08
代理机构		代理人
主权项
地址

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