Automatic radio range control for flight trainers,申请号US19400327271-传众专利搜索

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发明名称	Automatic radio range control for flight trainers
摘要
申请公布号	US2448555(A)	申请公布日期	1948.09.07
申请号	US19400327271	申请日期	1940.04.01
申请人	SORENSEN HELEN S	发明人	SORENSEN HELEN S.
分类号	G09B9/26	主分类号	G09B9/26
代理机构		代理人
主权项
地址

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