Railway-crossing signal,申请号US19290334099-传众专利搜索

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发明名称	Railway-crossing signal
摘要
申请公布号	US1748965(A)	申请公布日期	1930.03.04
申请号	US19290334099	申请日期	1929.01.21
申请人	ERNEST WATSON	发明人	WATSON ERNEST
分类号	B61L29/28	主分类号	B61L29/28
代理机构		代理人
主权项
地址

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