An improved navigational aid,申请号GB19500012673-传众专利搜索

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发明名称	An improved navigational aid
摘要
申请公布号	GB668034(A)	申请公布日期	1952.03.12
申请号	GB19500012673	申请日期	1950.05.19
申请人	MICHEL PAUL THEODORE DUPUY	发明人
分类号	G01C21/20	主分类号	G01C21/20
代理机构		代理人
主权项
地址

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