Improvements in or connected with indicator and announcement boards,申请号GB19290030644-传众专利搜索

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发明名称	Improvements in or connected with indicator and announcement boards
摘要
申请公布号	GB344531(A)	申请公布日期	1931.03.12
申请号	GB19290030644	申请日期	1930.07.09
申请人	THOMAS FRANK CATO	发明人
分类号	G08B5/02	主分类号	G08B5/02
代理机构		代理人
主权项
地址

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