Mine signalling device,申请号GB19500021891-传众专利搜索

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发明名称	Mine signalling device
摘要
申请公布号	GB690058(A)	申请公布日期	1953.04.08
申请号	GB19500021891	申请日期	1950.09.05
申请人	METRA;FRANTISEK BARVITIUS	发明人
分类号	G08B25/14	主分类号	G08B25/14
代理机构		代理人
主权项
地址

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