Indicator for the blind,申请号US19460697568-传众专利搜索

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发明名称	Indicator for the blind
摘要
申请公布号	US2506946(A)	申请公布日期	1950.05.09
申请号	US19460697568	申请日期	1946.09.17
申请人	WALKER JOSEPH B	发明人	WALKER JOSEPH B.
分类号	G01S13/46	主分类号	G01S13/46
代理机构		代理人
主权项
地址

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