Navigational aid device,申请号US19480061820-传众专利搜索

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发明名称	Navigational aid device
摘要
申请公布号	US2565745(A)	申请公布日期	1951.08.28
申请号	US19480061820	申请日期	1948.11.24
申请人	DAVID SKALKA	发明人	SKALKA DAVID
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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